Fix zero-items bug with getPageInfo

public/js/showcase.js

@@ -1,4 +1,5 @@
 const TimelineMediaTypes = {
+	UNKNOWN: 0,
     IMAGE: 1,
     VIDEO: 2,
     AUDIO: 3,

src/config/config.go.example

@@ -57,6 +57,14 @@ var Config = HMNConfig{
 		MemberRoleID:      "",
 		ShowcaseChannelID: "",
 		LibraryChannelID:  "",
+		StreamsChannelID:  "",
+	},
+	Twitch: TwitchConfig{
+		ClientID:       "",
+		ClientSecret:   "",
+		EventSubSecret: "",
+		BaseUrl:        "https://api.twitch.tv/helix",
+		BaseIDUrl:      "https://id.twitch.tv/oauth2",
 	},
 	EpisodeGuide: EpisodeGuide{
 		CineraOutputPath: "./annotations/",

src/config/types.go

@@ -27,6 +27,7 @@ type HMNConfig struct {
 	Email        EmailConfig
 	DigitalOcean DigitalOceanConfig
 	Discord      DiscordConfig
+	Twitch       TwitchConfig
 	EpisodeGuide EpisodeGuide
 }
 
@@ -76,9 +77,18 @@ type DiscordConfig struct {
 	MemberRoleID         string
 	ShowcaseChannelID    string
 	LibraryChannelID     string
+	StreamsChannelID     string
 	JamShowcaseChannelID string
 }
 
+type TwitchConfig struct {
+	ClientID       string
+	ClientSecret   string
+	EventSubSecret string // NOTE(asaf): Between 10-100 chars long. Anything will do.
+	BaseUrl        string
+	BaseIDUrl      string
+}
+
 type EpisodeGuide struct {
 	CineraOutputPath string
 	Projects         map[string]string // NOTE(asaf): Maps from slugs to default episode guide topic

src/hmndata/twitch.go

@@ -0,0 +1,111 @@
+package hmndata
+
+import (
+	"context"
+	"regexp"
+	"strings"
+
+	"git.handmade.network/hmn/hmn/src/db"
+	"git.handmade.network/hmn/hmn/src/models"
+	"git.handmade.network/hmn/hmn/src/oops"
+)
+
+const InvalidUserTwitchID = "INVALID_USER"
+
+type TwitchStreamer struct {
+	TwitchID    string
+	TwitchLogin string
+	UserID      *int
+	ProjectID   *int
+}
+
+var twitchRegex = regexp.MustCompile(`twitch\.tv/(?P<login>[^/]+)$`)
+
+func FetchTwitchStreamers(ctx context.Context, dbConn db.ConnOrTx) ([]TwitchStreamer, error) {
+	type linkResult struct {
+		Link models.Link `db:"link"`
+	}
+	streamers, err := db.Query(ctx, dbConn, linkResult{},
+		`
+		SELECT $columns
+		FROM
+			handmade_links AS link
+			LEFT JOIN auth_user AS link_owner ON link_owner.id = link.user_id
+		WHERE
+			url ~* 'twitch\.tv/([^/]+)$' AND
+			((link.user_id IS NOT NULL AND link_owner.status = $1) OR (link.project_id IS NOT NULL AND
+			(SELECT COUNT(*)
+			FROM
+				handmade_user_projects AS hup
+				JOIN auth_user AS project_owner ON project_owner.id = hup.user_id
+			WHERE
+				hup.project_id = link.project_id AND
+				project_owner.status != $1
+			) = 0))
+		`,
+		models.UserStatusApproved,
+	)
+	if err != nil {
+		return nil, oops.New(err, "failed to fetch twitch links")
+	}
+
+	result := make([]TwitchStreamer, 0, len(streamers))
+	for _, s := range streamers {
+		dbStreamer := s.(*linkResult).Link
+
+		streamer := TwitchStreamer{
+			UserID:    dbStreamer.UserID,
+			ProjectID: dbStreamer.ProjectID,
+		}
+
+		match := twitchRegex.FindStringSubmatch(dbStreamer.URL)
+		if match != nil {
+			login := strings.ToLower(match[twitchRegex.SubexpIndex("login")])
+			streamer.TwitchLogin = login
+		}
+		if len(streamer.TwitchLogin) > 0 {
+			duplicate := false
+			for _, r := range result {
+				if r.TwitchLogin == streamer.TwitchLogin {
+					duplicate = true
+					break
+				}
+			}
+			if !duplicate {
+				result = append(result, streamer)
+			}
+		}
+	}
+
+	return result, nil
+}
+
+func FetchTwitchLoginsForUserOrProject(ctx context.Context, dbConn db.ConnOrTx, userId *int, projectId *int) ([]string, error) {
+	links, err := db.Query(ctx, dbConn, models.Link{},
+		`
+		SELECT $columns
+		FROM
+			handmade_links AS link
+		WHERE
+			url ~* 'twitch\.tv/([^/]+)$'
+			AND ((user_id = $1 AND project_id IS NULL) OR (user_id IS NULL AND project_id = $2))
+		ORDER BY url ASC
+		`,
+		userId,
+		projectId,
+	)
+	if err != nil {
+		return nil, oops.New(err, "failed to fetch twitch links")
+	}
+	result := make([]string, 0, len(links))
+
+	for _, l := range links {
+		url := l.(*models.Link).URL
+		match := twitchRegex.FindStringSubmatch(url)
+		if match != nil {
+			login := strings.ToLower(match[twitchRegex.SubexpIndex("login")])
+			result = append(result, login)
+		}
+	}
+	return result, nil
+}

src/hmnurl/urls.go

@@ -687,6 +687,18 @@ func BuildAPICheckUsername() string {
 	return Url("/api/check_username", nil)
 }
 
+/*
+* Twitch stuff
+ */
+
+var RegexTwitchEventSubCallback = regexp.MustCompile("^/twitch_eventsub$")
+
+func BuildTwitchEventSubCallback() string {
+	return Url("/twitch_eventsub", nil)
+}
+
+var RegexTwitchDebugPage = regexp.MustCompile("^/twitch_debug$")
+
 /*
 * User assets
  */

src/migration/migrations/2022-03-15T012144Z_TwitchTables.go

@@ -0,0 +1,60 @@
+package migrations
+
+import (
+	"context"
+	"time"
+
+	"git.handmade.network/hmn/hmn/src/migration/types"
+	"git.handmade.network/hmn/hmn/src/oops"
+	"github.com/jackc/pgx/v4"
+)
+
+func init() {
+	registerMigration(TwitchTables{})
+}
+
+type TwitchTables struct{}
+
+func (m TwitchTables) Version() types.MigrationVersion {
+	return types.MigrationVersion(time.Date(2022, 3, 15, 1, 21, 44, 0, time.UTC))
+}
+
+func (m TwitchTables) Name() string {
+	return "TwitchTables"
+}
+
+func (m TwitchTables) Description() string {
+	return "Create tables for live twitch streams and twitch ID cache"
+}
+
+func (m TwitchTables) Up(ctx context.Context, tx pgx.Tx) error {
+	_, err := tx.Exec(ctx,
+		`
+		CREATE TABLE twitch_streams (
+			twitch_id VARCHAR(255) NOT NULL,
+			twitch_login VARCHAR(255) NOT NULL,
+			title VARCHAR(255) NOT NULL,
+			started_at TIMESTAMP WITH TIME ZONE
+		);
+		`,
+	)
+
+	if err != nil {
+		return oops.New(err, "failed to create twitch tables")
+	}
+	return err
+}
+
+func (m TwitchTables) Down(ctx context.Context, tx pgx.Tx) error {
+	_, err := tx.Exec(ctx,
+		`
+		DROP TABLE twitch_ids;
+		DROP TABLE twitch_streams;
+		`,
+	)
+
+	if err != nil {
+		return oops.New(err, "failed to create twitch tables")
+	}
+	return err
+}

src/migration/migrations/2022-03-15T063506Z_AddIndexOnTwitchStreams.go

@@ -0,0 +1,45 @@
+package migrations
+
+import (
+	"context"
+	"time"
+
+	"git.handmade.network/hmn/hmn/src/migration/types"
+	"github.com/jackc/pgx/v4"
+)
+
+func init() {
+	registerMigration(AddIndexOnTwitchStreams{})
+}
+
+type AddIndexOnTwitchStreams struct{}
+
+func (m AddIndexOnTwitchStreams) Version() types.MigrationVersion {
+	return types.MigrationVersion(time.Date(2022, 3, 15, 6, 35, 6, 0, time.UTC))
+}
+
+func (m AddIndexOnTwitchStreams) Name() string {
+	return "AddIndexOnTwitchStreams"
+}
+
+func (m AddIndexOnTwitchStreams) Description() string {
+	return "Add unique index on twitch streams"
+}
+
+func (m AddIndexOnTwitchStreams) Up(ctx context.Context, tx pgx.Tx) error {
+	_, err := tx.Exec(ctx,
+		`
+		CREATE UNIQUE INDEX twitch_streams_twitch_id ON twitch_streams (twitch_id);
+		`,
+	)
+	return err
+}
+
+func (m AddIndexOnTwitchStreams) Down(ctx context.Context, tx pgx.Tx) error {
+	_, err := tx.Exec(ctx,
+		`
+		DROP INDEX twitch_streams_twitch_id;
+		`,
+	)
+	return err
+}

src/models/twitch.go

@@ -0,0 +1,15 @@
+package models
+
+import "time"
+
+type TwitchID struct {
+	ID    string `db:"id"`
+	Login string `db:"login"`
+}
+
+type TwitchStream struct {
+	ID        string    `db:"twitch_id"`
+	Login     string    `db:"twitch_login"`
+	Title     string    `db:"title"`
+	StartedAt time.Time `db:"started_at"`
+}

src/templates/src/include/timeline_item.html

@@ -56,6 +56,10 @@
 				<audio src="{{ .AssetUrl }}" controls>
 			{{ else if eq .Type mediaembed }}
 				{{ .EmbedHTML }}
+			{{ else }}
+				<div class="project-card br2 pv1 ph2">
+					<a href="{{ .AssetUrl }}" target="_blank">{{ .Filename }} ({{ filesize .FileSize }})</a>
+				</div>
 			{{ end }}
 		</div>
 	{{ end }}

src/templates/src/landing.html

@@ -121,6 +121,7 @@
 			#welcome-logo svg {
 				height: 100%;
 				fill: currentColor;
+				opacity: 0.9;
 			}
 			
 			#welcome-content a {

src/templates/src/manifesto.html

@@ -2,22 +2,21 @@
 
 {{ define "content" }}
 <div class="center-layout mw7 mv3 ph3 ph0-ns post-content">
-	<p>Modern computer hardware is amazing. Manufacturers have orchestrated billions of pieces of silicon into terrifyingly complex and efficient structures that sweep electrons through innumerable tangled paths, branchings, and reunions with the sole purpose of performing computations at more than a billion times per second. This awe-inspiring piece of computational wizardry has at its disposal multiple billions of uniquely addressible silicon plates where it can store the results of millions of computations in an array of several vanishingly small chips. All of this hardware, though each component often sits no further than 7 or 8 centimeters away from the others, cycles so fast that the speed of light, a physical law of the universe, limits the rate at which they communicate with each other.</p>
-	<h2>So why is software still slow?</h2>
-	<p>Why does it take your operating system 10 seconds, 30 seconds, a minute to boot up? Why does your word processor freeze when you save a document on the cloud? Why does your web browser take 3, 4, 10 seconds to load a web page? Why does your phone struggle to keep more than a few apps open at a time? And why does each update somehow make the problem worse?</p>
-	<h2>We made it slow.</h2>
-	<p>Not necessarily you, not necessarily me, not necessarily any single person in particular. But we, the software development community, made it slow by ignoring the fundamental reality of our occupation. We write code, code that runs on computers. Real computers, with central processing units and random access memory and hard disk drives and display buffers. Real computers, with integer and bitwise math and floating point units and L2 caches, with threads and cores and a tenuous little network connection to a million billion other computers. Real computers not built for ease of human understanding but for blindingly, incomprehensibly fast speed.</p>
-	<h2>A lot of us have forgotten that.</h2>
-	<p>In our haste to get our products, our projects, the works of our hands and minds, to as many people as possible, we take shortcuts. We make assumptions. We generalize, and abstract, and assume that just because these problems have been solved before that they never need to be solved again. We build abstraction layers, then forget we built them and build more on top.</p>
-	<p>And it's true that many of us think we do not have the time, the money, the mental bandwidth to always consider these things in detail. The deadline is approaching or the rent is due or we have taxes to fill out and a manager on our back and someone asking us why we always spend so much time at the office, and we just have to stick the library or virtual machine or garbage collector in there to cover up the places we can't think through right now.</p>
-	<p>Others of us were never taught to think about the computer itself. We learned about objects and classes and templates and how to make our code clean and pretty. We learned how to write code to make the client or the manager or the teacher happy, but made the processor churn. And because we did, that amazing speed we'd been granted was wasted, by us, in a death by a thousand abstraction layers.</p>
-	<h2>But some of us aren't satisfied with that.</h2>
-	<p>Some of us take a few extra steps into the covered territory, the wheels sitting, motionless, in a pile behind us, examine their designs and decide there is a better way. The more experienced among us remember how software used to be, the potential that we know exists for computer programs to be useful, general, and efficient. Others of us got fed up with the tools we were expected to use without complaint, but which failed us time and time again. Some of us are just curious and don't know what's good for us. Don't trust what we've been told is good for us.</p>
-	<p>We sat down and looked at our hardware, and examined our data, and thought about how to use the one to transform the other. We tinkered, and measured, and read, and compared, and wrote, and refined, and modified, and measured again, over and over, until we found we had built the same thing, but 10 times faster and incomparably more useful to the people we designed it for. And we had built it by hand.</p>
-	<p>That is what Handmade means. It's not a technique or a language or a management strategy, it isn't a formula or a library or an abstraction. It's an idea. The idea that we can build software that works with the computer, not against it. The idea that sometimes an individual programmer can be more productive than a large team, that a small group can do more than an army of software engineers and *do it better*. The idea that programming is about transforming data and we wield the code, the tool we use to bend that data to our will.</p>
-	<p>It doesn't require a degree, or a dissertation, or a decade of experience. You don't need an expensive computer or a certificate or even prior knowledge. All you need is an open mind and a sense of curiosity. We'll help you with the rest.</p>
+	<h2>Computers are amazing.</h2>
+	<p>Computers have changed our lives for the better. They allow us to learn, connect with each other, and express ourselves in amazing new ways. And every year computers get more powerful, less expensive, and more accessible - computers today can do things we hardly dreamed of twenty years ago.</p>
+	<h2>So why is software so terrible?</h2>
+	<p>Why do web pages take ten seconds to load? Why do apps mess up scrolling? Why does your phone battery still die so quickly? And why does each update somehow make the problem worse?</p>
+	<p>And why do we all use huge frameworks that no one understands? Why do our projects take several minutes to compile? Why do we have to restart our language servers every twenty minutes? And why does everyone think this is fine?</p>
+	<h2>We made it terrible.</h2>
+	<p>Not necessarily you or me, not necessarily anyone in particular. But we, the software development community, made it terrible through our thoughtless behavior. We ignored the hardware. We glued together libraries so we didn't have to learn. We built layers on top of layers, until no one knew how anything worked.</p>
+	<p>But worst of all: we put our own desires above the user's.</p>
+	<p>You may have learned that programming is about classes, monads, or type systems. You may have been taught to keep your code clean and pretty, abstract and future-proof. None of that matters when the end result is garbage.</p>
+	<h2>But there is another way.</h2>
+	<p>Some of us aren't satisfied with the current state of software. We think that wheels need to be reinvented. We like looking under the hood, understanding what others take for granted. We remember how software used to be, and know how much potential there is to make it better. We fight against the status quo, because we know how things <em>could</em> be.</p>
+	<p>This is what Handmade means. It's not a technique or a language or a management strategy. It's not a library or a framework or a paradigm. It's an idea. The idea that we can build software that works with the computer, not against it. The idea that the user matters more than the programmer. The idea that sometimes a small group can do more than an army of software engineers, and <em>do it better</em>.</p>
+	<p>You don't need a degree, a dissertation, or a decade of experience. You don't need an expensive computer or a certificate. All you need is an open mind and a sense of curiosity. We'll help you with the rest.</p>
 	<h2>Will you join us?</h2>
 	<p>Will you build your software by hand?</p>
-	<p class="c--dim i">Written by Andrew Chronister</p>
+	<p class="c--dim i">Written by Ben Visness and the Handmade community. Original by Andrew Chronister.</p>
 </div>
 {{ end }}

src/templates/src/snippet.html

@@ -21,6 +21,10 @@
                     <div class="mb3 aspect-ratio aspect-ratio--16x9">
                         {{ .EmbedHTML }}
                     </div>
+				{{ else }}
+					<div class="project-card br2 pv1 ph2">
+						<a href="{{ .AssetUrl }}" target="_blank">{{ .Filename }} ({{ filesize .FileSize }})</a>
+					</div>
                 {{ end }}
             {{ end }}
         </div>

src/templates/svg/hmn_circuit.svg

@@ -1,102 +1,83 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
-<svg viewBox="0 0 3706 1082" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xml:space="preserve" xmlns:serif="http://www.serif.com/" style="fill-rule:evenodd;clip-rule:evenodd;stroke-linejoin:round;stroke-miterlimit:2;">
-    <g id="Banner-Logo" serif:id="Banner Logo" transform="matrix(48.7805,0,0,48.7805,-9370.23,-9931.81)">
-        <g transform="matrix(1,0,0,1,-0.497771,-0.118656)">
+<svg width="100%" height="100%" viewBox="0 0 2000 629" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xml:space="preserve" xmlns:serif="http://www.serif.com/" style="fill-rule:evenodd;clip-rule:evenodd;stroke-linejoin:round;stroke-miterlimit:2;">
+    <g id="Wires" transform="matrix(26.3259,0,0,26.3259,-5070.03,-5340.32)">
         <g transform="matrix(1,0,0,-1,-0.808418,430.006)">
-                <path d="M193.396,215.074L201.366,215.074" style="fill:none;"/>
+            <path d="M194.555,216.234C193.915,216.234 193.396,215.714 193.396,215.074C193.396,214.434 193.915,213.915 194.555,213.915C195.195,213.915 195.715,214.434 195.715,215.074C195.715,215.714 195.195,216.234 194.555,216.234ZM194.555,215.461C194.768,215.461 194.942,215.288 194.942,215.074C194.942,214.861 194.768,214.688 194.555,214.688C194.342,214.688 194.169,214.861 194.169,215.074C194.169,215.288 194.342,215.461 194.555,215.461Z"/>
         </g>
         <g transform="matrix(1,0,0,-1,-0.808418,430.006)">
-                <path d="M194.555,216.234C193.915,216.234 193.396,215.714 193.396,215.074C193.396,214.434 193.915,213.915 194.555,213.915C195.195,213.915 195.715,214.434 195.715,215.074C195.715,215.714 195.195,216.234 194.555,216.234ZM194.555,215.461C194.768,215.461 194.942,215.288 194.942,215.074C194.942,214.861 194.768,214.688 194.555,214.688C194.342,214.688 194.169,214.861 194.169,215.074C194.169,215.288 194.342,215.461 194.555,215.461Z" style=""/>
-            </g>
-            <g transform="matrix(1,0,0,-1,-0.808418,430.006)">
-                <path d="M195.328,214.688L201.366,214.688C201.579,214.688 201.753,214.861 201.753,215.074C201.753,215.288 201.579,215.461 201.366,215.461L195.328,215.461C195.115,215.461 194.942,215.288 194.942,215.074C194.942,214.861 195.115,214.688 195.328,214.688Z" style=""/>
+            <path d="M195.328,214.688L201.366,214.688C201.579,214.688 201.753,214.861 201.753,215.074C201.753,215.288 201.579,215.461 201.366,215.461L195.328,215.461C195.115,215.461 194.942,215.288 194.942,215.074C194.942,214.861 195.115,214.688 195.328,214.688Z"/>
         </g>
         <g transform="matrix(-1,0,0,-1,461.953,430.006)">
-                <path d="M193.396,215.074L201.366,215.074" style="fill:none;"/>
+            <path d="M194.555,213.915C193.915,213.915 193.396,214.434 193.396,215.074C193.396,215.714 193.915,216.234 194.555,216.234C195.195,216.234 195.715,215.714 195.715,215.074C195.715,214.434 195.195,213.915 194.555,213.915ZM194.555,214.688C194.768,214.688 194.942,214.861 194.942,215.074C194.942,215.288 194.768,215.461 194.555,215.461C194.342,215.461 194.169,215.288 194.169,215.074C194.169,214.861 194.342,214.688 194.555,214.688Z"/>
         </g>
         <g transform="matrix(-1,0,0,-1,461.953,430.006)">
-                <path d="M194.555,213.915C193.915,213.915 193.396,214.434 193.396,215.074C193.396,215.714 193.915,216.234 194.555,216.234C195.195,216.234 195.715,215.714 195.715,215.074C195.715,214.434 195.195,213.915 194.555,213.915ZM194.555,214.688C194.768,214.688 194.942,214.861 194.942,215.074C194.942,215.288 194.768,215.461 194.555,215.461C194.342,215.461 194.169,215.288 194.169,215.074C194.169,214.861 194.342,214.688 194.555,214.688Z" style=""/>
-            </g>
-            <g transform="matrix(-1,0,0,-1,461.953,430.006)">
-                <path d="M195.328,215.461L201.366,215.461C201.579,215.461 201.753,215.288 201.753,215.074C201.753,214.861 201.579,214.688 201.366,214.688L195.328,214.688C195.115,214.688 194.942,214.861 194.942,215.074C194.942,215.288 195.115,215.461 195.328,215.461Z" style=""/>
+            <path d="M195.328,215.461L201.366,215.461C201.579,215.461 201.753,215.288 201.753,215.074C201.753,214.861 201.579,214.688 201.366,214.688L195.328,214.688C195.115,214.688 194.942,214.861 194.942,215.074C194.942,215.288 195.115,215.461 195.328,215.461Z"/>
         </g>
         <g transform="matrix(1,0,0,-1,0.0431238,430.006)">
-                <path d="M200.515,215.074L201.656,213.933" style="fill:none;"/>
-            </g>
-            <g transform="matrix(1,0,0,-1,0.0431238,430.006)">
-                <path d="M200.241,214.801L201.383,213.66L201.929,214.206L200.788,215.348L200.241,214.801Z" style=""/>
+            <path d="M200.241,214.801L201.383,213.66L201.929,214.206L200.788,215.348L200.241,214.801Z"/>
         </g>
         <g transform="matrix(1,0,0,-1,58.9314,428.865)">
-                <path d="M200.515,215.074L201.656,213.933" style="fill:none;"/>
-            </g>
-            <g transform="matrix(1,0,0,-1,58.9314,428.865)">
-                <path d="M200.241,214.801L201.383,213.66L201.929,214.206L200.788,215.348L200.241,214.801Z" style=""/>
+            <path d="M200.241,214.801L201.383,213.66L201.929,214.206L200.788,215.348L200.241,214.801Z"/>
         </g>
         <g transform="matrix(1,0,0,-1,1.04312,431.006)">
-                <path d="M205.833,209.755L207.639,207.95" style="fill:none;"/>
+            <path d="M205.56,209.482L207.365,207.677L207.912,208.223L206.107,210.029L205.56,209.482Z"/>
         </g>
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+    <g id="Name" transform="matrix(26.3259,0,0,26.3259,-5177.33,-4754.86)">
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+        <path d="M221.267,188.32L223.079,196.869L222.087,196.869L221.757,195.216L219.751,195.216L219.409,196.869L218.417,196.869L220.241,188.32L221.267,188.32ZM219.922,194.258L221.586,194.258L220.754,190.03L219.922,194.258Z" style="fill-rule:nonzero;"/>
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+        <g transform="matrix(1,0,0,1,0,0.0379854)">
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src/templates/templates.go

@@ -193,6 +193,25 @@ var HMNTemplateFuncs = template.FuncMap{
 	"noescape": func(str string) template.HTML {
 		return template.HTML(str)
 	},
+	"filesize": func(numBytes int) string {
+		scales := []string{
+			" bytes",
+			"kb",
+			"mb",
+			"gb",
+		}
+		num := float64(numBytes)
+		scale := 0
+		for num > 1024 && scale < len(scales)-1 {
+			num /= 1024
+			scale += 1
+		}
+		precision := 0
+		if scale > 0 {
+			precision = 2
+		}
+		return fmt.Sprintf("%.*f%s", precision, num, scales[scale])
+	},
 
 	// NOTE(asaf): Template specific functions:
 	"projectcarddata": func(project Project, classes string) ProjectCardData {

src/templates/types.go

@@ -305,7 +305,8 @@ type TimelineItem struct {
 type TimelineItemMediaType int
 
 const (
-	TimelineItemMediaTypeImage TimelineItemMediaType = iota + 1
+	TimelineItemMediaTypeUnknown TimelineItemMediaType = iota
+	TimelineItemMediaTypeImage
 	TimelineItemMediaTypeVideo
 	TimelineItemMediaTypeAudio
 	TimelineItemMediaTypeEmbed
@@ -318,6 +319,8 @@ type TimelineItemMedia struct {
 	ThumbnailUrl        string
 	MimeType            string
 	Width, Height       int
+	Filename            string
+	FileSize            int
 	ExtraOpenGraphItems []OpenGraphItem
 }
 

src/twitch/rest.go

@@ -0,0 +1,450 @@
+package twitch
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strconv"
+	"strings"
+	"time"
+
+	"git.handmade.network/hmn/hmn/src/config"
+	"git.handmade.network/hmn/hmn/src/hmnurl"
+	"git.handmade.network/hmn/hmn/src/logging"
+	"git.handmade.network/hmn/hmn/src/oops"
+	"git.handmade.network/hmn/hmn/src/utils"
+)
+
+var twitchAPIBaseUrl = config.Config.Twitch.BaseUrl
+
+var HitRateLimit = errors.New("hit rate limit")
+var MaxRetries = errors.New("hit max retries")
+
+var httpClient = &http.Client{}
+
+// NOTE(asaf): Access token is not thread-safe right now.
+//             All twitch requests are made through the goroutine in MonitorTwitchSubscriptions.
+var activeAccessToken string
+var rateLimitReset time.Time
+
+type twitchUser struct {
+	TwitchID    string
+	TwitchLogin string
+}
+
+func getTwitchUsersByLogin(ctx context.Context, logins []string) ([]twitchUser, error) {
+	result := make([]twitchUser, 0, len(logins))
+	numChunks := len(logins)/100 + 1
+	for i := 0; i < numChunks; i++ {
+		query := url.Values{}
+		query.Add("first", "100")
+		for _, login := range logins[i*100 : utils.IntMin((i+1)*100, len(logins))] {
+			query.Add("login", login)
+		}
+		req, err := http.NewRequestWithContext(ctx, "GET", buildUrl("/users", query.Encode()), nil)
+		if err != nil {
+			return nil, oops.New(err, "failed to create requset")
+		}
+		res, err := doRequest(ctx, true, req)
+		if err != nil {
+			return nil, oops.New(err, "failed to fetch twitch users")
+		}
+
+		type user struct {
+			ID    string `json:"id"`
+			Login string `json:"login"`
+		}
+
+		type twitchResponse struct {
+			Data []user `json:"data"`
+		}
+
+		body, err := io.ReadAll(res.Body)
+		res.Body.Close()
+		if err != nil {
+			return nil, oops.New(err, "failed to read response body while fetching twitch users")
+		}
+
+		var userResponse twitchResponse
+		err = json.Unmarshal(body, &userResponse)
+		if err != nil {
+			return nil, oops.New(err, "failed to parse twitch response while fetching twitch users")
+		}
+
+		for _, u := range userResponse.Data {
+			result = append(result, twitchUser{
+				TwitchID:    u.ID,
+				TwitchLogin: u.Login,
+			})
+		}
+	}
+
+	return result, nil
+}
+
+type streamStatus struct {
+	TwitchID    string
+	TwitchLogin string
+	Live        bool
+	Title       string
+	StartedAt   time.Time
+	Category    string
+	Tags        []string
+}
+
+func getStreamStatus(ctx context.Context, twitchIDs []string) ([]streamStatus, error) {
+	result := make([]streamStatus, 0, len(twitchIDs))
+	numChunks := len(twitchIDs)/100 + 1
+	for i := 0; i < numChunks; i++ {
+		query := url.Values{}
+		query.Add("first", "100")
+		for _, tid := range twitchIDs[i*100 : utils.IntMin((i+1)*100, len(twitchIDs))] {
+			query.Add("user_id", tid)
+		}
+		req, err := http.NewRequestWithContext(ctx, "GET", buildUrl("/streams", query.Encode()), nil)
+		if err != nil {
+			return nil, oops.New(err, "failed to create request")
+		}
+		res, err := doRequest(ctx, true, req)
+		if err != nil {
+			return nil, oops.New(err, "failed to fetch stream statuses")
+		}
+
+		type twitchStatus struct {
+			TwitchID    string   `json:"user_id"`
+			TwitchLogin string   `json:"user_login"`
+			GameID      string   `json:"game_id"`
+			Type        string   `json:"type"`
+			Title       string   `json:"title"`
+			StartedAt   string   `json:"started_at"`
+			Thumbnail   string   `json:"thumbnail_url"`
+			Tags        []string `json:"tag_ids"`
+		}
+
+		type twitchResponse struct {
+			Data []twitchStatus `json:"data"`
+		}
+		body, err := io.ReadAll(res.Body)
+		res.Body.Close()
+		if err != nil {
+			return nil, oops.New(err, "failed to read response body while processing stream statuses")
+		}
+
+		var streamResponse twitchResponse
+		err = json.Unmarshal(body, &streamResponse)
+		if err != nil {
+			return nil, oops.New(err, "failed to parse twitch response while processing stream statuses")
+		}
+
+		for _, d := range streamResponse.Data {
+			started, err := time.Parse(time.RFC3339, d.StartedAt)
+			if err != nil {
+				logging.ExtractLogger(ctx).Warn().Str("Time string", d.StartedAt).Msg("Failed to parse twitch timestamp")
+				started = time.Now()
+			}
+			status := streamStatus{
+				TwitchID:    d.TwitchID,
+				TwitchLogin: d.TwitchLogin,
+				Live:        d.Type == "live",
+				Title:       d.Title,
+				StartedAt:   started,
+				Category:    d.GameID,
+				Tags:        d.Tags,
+			}
+			result = append(result, status)
+		}
+	}
+
+	return result, nil
+}
+
+type twitchEventSub struct {
+	EventID    string
+	TwitchID   string
+	Type       string
+	GoodStatus bool
+}
+
+func getEventSubscriptions(ctx context.Context) ([]twitchEventSub, error) {
+	result := make([]twitchEventSub, 0)
+	after := ""
+	for {
+		query := url.Values{}
+		if len(after) > 0 {
+			query.Add("after", after)
+		}
+		req, err := http.NewRequestWithContext(ctx, "GET", buildUrl("/eventsub/subscriptions", query.Encode()), nil)
+		if err != nil {
+			return nil, oops.New(err, "failed to create request")
+		}
+		res, err := doRequest(ctx, true, req)
+		if err != nil {
+			return nil, oops.New(err, "failed to fetch twitch event subscriptions")
+		}
+
+		type eventSub struct {
+			ID        string `json:"id"`
+			Status    string `json:"status"`
+			Type      string `json:"type"`
+			Condition struct {
+				TwitchID string `json:"broadcaster_user_id"`
+			} `json:"condition"`
+		}
+
+		type twitchResponse struct {
+			Data       []eventSub `json:"data"`
+			Pagination *struct {
+				After string `json:"cursor"`
+			} `json:"pagination"`
+		}
+
+		body, err := io.ReadAll(res.Body)
+		res.Body.Close()
+		if err != nil {
+			return nil, oops.New(err, "failed to read response body while fetching twitch eventsubs")
+		}
+
+		var eventSubResponse twitchResponse
+		err = json.Unmarshal(body, &eventSubResponse)
+		if err != nil {
+			return nil, oops.New(err, "failed to parse twitch response while fetching twitch eventsubs")
+		}
+
+		for _, es := range eventSubResponse.Data {
+			result = append(result, twitchEventSub{
+				EventID:    es.ID,
+				TwitchID:   es.Condition.TwitchID,
+				Type:       es.Type,
+				GoodStatus: es.Status == "enabled" || es.Status == "webhook_callback_verification_pending",
+			})
+		}
+
+		if eventSubResponse.Pagination == nil || eventSubResponse.Pagination.After == "" {
+			return result, nil
+		} else {
+			after = eventSubResponse.Pagination.After
+		}
+	}
+}
+
+func subscribeToEvent(ctx context.Context, eventType string, twitchID string) error {
+	type eventBody struct {
+		Type      string `json:"type"`
+		Version   string `json:"version"`
+		Condition struct {
+			TwitchID string `json:"broadcaster_user_id"`
+		} `json:"condition"`
+		Transport struct {
+			Method   string `json:"method"`
+			Callback string `json:"callback"`
+			Secret   string `json:"secret"`
+		} `json:"transport"`
+	}
+
+	ev := eventBody{
+		Type:    eventType,
+		Version: "1",
+	}
+	ev.Condition.TwitchID = twitchID
+	ev.Transport.Method = "webhook"
+	// NOTE(asaf): Twitch has special treatment for localhost. We can keep this around for live/beta because it just won't replace anything.
+	ev.Transport.Callback = strings.ReplaceAll(hmnurl.BuildTwitchEventSubCallback(), "handmade.local:9001", "localhost")
+	ev.Transport.Secret = config.Config.Twitch.EventSubSecret
+
+	evJson, err := json.Marshal(ev)
+	if err != nil {
+		return oops.New(err, "failed to marshal event sub data")
+	}
+	req, err := http.NewRequestWithContext(ctx, "POST", buildUrl("/eventsub/subscriptions", ""), bytes.NewReader(evJson))
+	req.Header.Set("Content-Type", "application/json")
+	if err != nil {
+		return oops.New(err, "failed to create request")
+	}
+	res, err := doRequest(ctx, true, req)
+	if err != nil {
+		return oops.New(err, "failed to create new event subscription")
+	}
+	defer readAndClose(res)
+
+	if res.StatusCode >= 300 {
+		body, err := io.ReadAll(res.Body)
+		res.Body.Close()
+		if err != nil {
+			return oops.New(err, "failed to read response body while creating twitch eventsubs")
+		}
+		logging.ExtractLogger(ctx).Error().Interface("Headers", res.Header).Int("Status code", res.StatusCode).Str("Body", string(body[:])).Msg("Failed to create twitch event sub")
+		return oops.New(nil, "failed to create new event subscription")
+	}
+	return nil
+}
+
+func unsubscribeFromEvent(ctx context.Context, eventID string) error {
+	query := url.Values{}
+	query.Add("id", eventID)
+	req, err := http.NewRequestWithContext(ctx, "DELETE", buildUrl("/eventsub/subscriptions", query.Encode()), nil)
+	if err != nil {
+		return oops.New(err, "failed to create request")
+	}
+	res, err := doRequest(ctx, true, req)
+	if err != nil {
+		return oops.New(err, "failed to delete new event subscription")
+	}
+	defer readAndClose(res)
+
+	if res.StatusCode > 300 {
+		body, err := io.ReadAll(res.Body)
+		res.Body.Close()
+		if err != nil {
+			return oops.New(err, "failed to read response body while deleting twitch eventsubs")
+		}
+		logging.ExtractLogger(ctx).Error().Interface("Headers", res.Header).Int("Status code", res.StatusCode).Str("Body", string(body[:])).Msg("Failed to delete twitch event sub")
+		return oops.New(nil, "failed to delete new event subscription")
+	}
+	return nil
+}
+
+func doRequest(ctx context.Context, waitOnRateLimit bool, req *http.Request) (*http.Response, error) {
+	serviceUnavailable := false
+	numRetries := 5
+
+	for {
+		if numRetries == 0 {
+			return nil, MaxRetries
+		}
+		numRetries -= 1
+
+		now := time.Now()
+		if rateLimitReset.After(now) {
+			if waitOnRateLimit {
+				timer := time.NewTimer(rateLimitReset.Sub(now))
+				select {
+				case <-timer.C:
+				case <-ctx.Done():
+					return nil, errors.New("request interrupted during rate limiting")
+				}
+			} else {
+				return nil, HitRateLimit
+			}
+		}
+
+		req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", activeAccessToken))
+		req.Header.Set("Client-Id", config.Config.Twitch.ClientID)
+		res, err := httpClient.Do(req)
+		if err != nil {
+			return nil, oops.New(err, "twitch request failed")
+		}
+
+		if res.StatusCode != 503 {
+			serviceUnavailable = false
+		}
+
+		if res.StatusCode >= 200 && res.StatusCode < 300 {
+			return res, nil
+		} else if res.StatusCode == 503 {
+			readAndClose(res)
+			if serviceUnavailable {
+				// NOTE(asaf): The docs say we should retry once if we receive 503
+				return nil, oops.New(nil, "got 503 Service Unavailable twice in a row")
+			} else {
+				serviceUnavailable = true
+			}
+		} else if res.StatusCode == 429 {
+			logging.ExtractLogger(ctx).Warn().Interface("Headers", res.Header).Msg("Hit Twitch rate limit")
+			err = updateRateLimitReset(res)
+			if err != nil {
+				return nil, err
+			}
+		} else if res.StatusCode == 401 {
+			logging.ExtractLogger(ctx).Warn().Msg("Twitch refresh token is invalid. Renewing...")
+			readAndClose(res)
+			err = refreshAccessToken(ctx)
+			if err != nil {
+				return nil, err
+			}
+		} else {
+			body, err := io.ReadAll(res.Body)
+			if err != nil {
+				return nil, oops.New(err, "failed to read response body")
+			}
+			logging.ExtractLogger(ctx).Warn().Interface("Headers", res.Header).Int("Status code", res.StatusCode).Str("Body", string(body[:])).Msg("Unexpected status code from twitch")
+			res.Body.Close()
+			return res, oops.New(nil, "got an unexpected status code from twitch")
+		}
+	}
+}
+
+func updateRateLimitReset(res *http.Response) error {
+	defer readAndClose(res)
+
+	resetStr := res.Header.Get("Ratelimit-Reset")
+	if len(resetStr) == 0 {
+		return oops.New(nil, "no ratelimit data on response")
+	}
+
+	resetUnix, err := strconv.Atoi(resetStr)
+	if err != nil {
+		return oops.New(err, "failed to parse reset time")
+	}
+
+	rateLimitReset = time.Unix(int64(resetUnix), 0)
+	return nil
+}
+
+type AccessTokenResponse struct {
+	AccessToken string `json:"access_token"`
+}
+
+func refreshAccessToken(ctx context.Context) error {
+	logging.ExtractLogger(ctx).Info().Msg("Refreshing twitch token")
+	query := url.Values{}
+	query.Add("client_id", config.Config.Twitch.ClientID)
+	query.Add("client_secret", config.Config.Twitch.ClientSecret)
+	query.Add("grant_type", "client_credentials")
+	url := fmt.Sprintf("%s/token?%s", config.Config.Twitch.BaseIDUrl, query.Encode())
+	req, err := http.NewRequestWithContext(ctx, "POST", url, nil)
+	if err != nil {
+		return oops.New(err, "failed to create request")
+	}
+
+	res, err := httpClient.Do(req)
+	if err != nil {
+		return oops.New(err, "failed to request new access token")
+	}
+	defer readAndClose(res)
+
+	if res.StatusCode >= 400 {
+		// NOTE(asaf): The docs don't specify the error cases for this call.
+		// NOTE(asaf): According to the docs rate limiting is per-token, and we don't use a token for this call,
+		//             so who knows how rate limiting works here.
+		body, _ := io.ReadAll(res.Body)
+		logging.ExtractLogger(ctx).Error().Interface("Headers", res.Header).Int("Status code", res.StatusCode).Str("body", string(body[:])).Msg("Got bad status code from twitch access token refresh")
+		return oops.New(nil, "received unexpected status code from twitch access token refresh")
+	}
+
+	body, err := io.ReadAll(res.Body)
+	if err != nil {
+		return oops.New(err, "failed to read response body")
+	}
+	var accessTokenResponse AccessTokenResponse
+	err = json.Unmarshal(body, &accessTokenResponse)
+	if err != nil {
+		return oops.New(err, "failed to unmarshal access token response")
+	}
+
+	activeAccessToken = accessTokenResponse.AccessToken
+	return nil
+}
+
+func readAndClose(res *http.Response) {
+	io.ReadAll(res.Body)
+	res.Body.Close()
+}
+
+func buildUrl(path string, queryParams string) string {
+	return fmt.Sprintf("%s%s?%s", config.Config.Twitch.BaseUrl, path, queryParams)
+}

src/twitch/twitch.go

@@ -0,0 +1,514 @@
+package twitch
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"git.handmade.network/hmn/hmn/src/config"
+	"git.handmade.network/hmn/hmn/src/db"
+	"git.handmade.network/hmn/hmn/src/discord"
+	"git.handmade.network/hmn/hmn/src/hmndata"
+	"git.handmade.network/hmn/hmn/src/logging"
+	"git.handmade.network/hmn/hmn/src/models"
+	"git.handmade.network/hmn/hmn/src/oops"
+	"git.handmade.network/hmn/hmn/src/perf"
+	"github.com/jackc/pgx/v4/pgxpool"
+)
+
+type twitchNotification struct {
+	TwitchID string
+	Type     twitchNotificationType
+}
+
+var twitchNotificationChannel chan twitchNotification
+var linksChangedChannel chan struct{}
+
+func MonitorTwitchSubscriptions(ctx context.Context, dbConn *pgxpool.Pool) <-chan struct{} {
+	log := logging.ExtractLogger(ctx).With().Str("twitch goroutine", "stream monitor").Logger()
+	ctx = logging.AttachLoggerToContext(&log, ctx)
+
+	if config.Config.Twitch.ClientID == "" {
+		log.Warn().Msg("No twitch config provided.")
+		done := make(chan struct{}, 1)
+		done <- struct{}{}
+		return done
+	}
+
+	twitchNotificationChannel = make(chan twitchNotification, 100)
+	linksChangedChannel = make(chan struct{}, 10)
+	done := make(chan struct{})
+
+	go func() {
+		defer func() {
+			log.Info().Msg("Shutting down twitch monitor")
+			done <- struct{}{}
+		}()
+		log.Info().Msg("Running twitch monitor...")
+
+		err := refreshAccessToken(ctx)
+		if err != nil {
+			log.Error().Err(err).Msg("Failed to fetch refresh token on start")
+			return
+		}
+
+		monitorTicker := time.NewTicker(2 * time.Hour)
+		firstRunChannel := make(chan struct{}, 1)
+		firstRunChannel <- struct{}{}
+
+		timers := make([]*time.Timer, 0)
+		expiredTimers := make(chan *time.Timer, 10)
+		for {
+			select {
+			case <-ctx.Done():
+				for _, timer := range timers {
+					timer.Stop()
+				}
+				return
+			case expired := <-expiredTimers:
+				for idx, timer := range timers {
+					if timer == expired {
+						timers = append(timers[:idx], timers[idx+1:]...)
+						break
+					}
+				}
+			case <-firstRunChannel:
+				syncWithTwitch(ctx, dbConn, true)
+			case <-monitorTicker.C:
+				syncWithTwitch(ctx, dbConn, true)
+			case <-linksChangedChannel:
+				// NOTE(asaf): Since we update links inside transactions for users/projects
+				//             we won't see the updated list of links until the transaction is committed.
+				//             Waiting 5 seconds is just a quick workaround for that. It's not
+				//             convenient to only trigger this after the transaction is committed.
+				var timer *time.Timer
+				t := time.AfterFunc(5*time.Second, func() {
+					expiredTimers <- timer
+					syncWithTwitch(ctx, dbConn, false)
+				})
+				timer = t
+				timers = append(timers, t)
+			case notification := <-twitchNotificationChannel:
+				if notification.Type == notificationTypeRevocation {
+					syncWithTwitch(ctx, dbConn, false)
+				} else {
+					if notification.Type == notificationTypeChannelUpdate {
+						// NOTE(asaf): The twitch API (getStreamStatus) lags behind the notification and
+						//             would return old data if we called it immediately, so we have to
+						//             wait a bit before we process the notification. We can get the
+						//             category from the notification, but not the tags (or the up-to-date title),
+						//             so we can't really skip this.
+						var timer *time.Timer
+						t := time.AfterFunc(3*time.Minute, func() {
+							expiredTimers <- timer
+							processEventSubNotification(ctx, dbConn, &notification)
+						})
+						timer = t
+						timers = append(timers, t)
+					} else {
+						processEventSubNotification(ctx, dbConn, &notification)
+					}
+				}
+			}
+		}
+	}()
+
+	return done
+}
+
+type twitchNotificationType int
+
+const (
+	notificationTypeNone          twitchNotificationType = 0
+	notificationTypeOnline                               = 1
+	notificationTypeOffline                              = 2
+	notificationTypeChannelUpdate                        = 3
+
+	notificationTypeRevocation = 4
+)
+
+func QueueTwitchNotification(messageType string, body []byte) error {
+	var notification twitchNotification
+	if messageType == "notification" {
+		type notificationJson struct {
+			Subscription struct {
+				Type string `json:"type"`
+			} `json:"subscription"`
+			Event struct {
+				BroadcasterUserID    string `json:"broadcaster_user_id"`
+				BroadcasterUserLogin string `json:"broadcaster_user_login"`
+			} `json:"event"`
+		}
+		var incoming notificationJson
+		err := json.Unmarshal(body, &incoming)
+		if err != nil {
+			return oops.New(err, "failed to parse notification body")
+		}
+
+		notification.TwitchID = incoming.Event.BroadcasterUserID
+		switch incoming.Subscription.Type {
+		case "stream.online":
+			notification.Type = notificationTypeOnline
+		case "stream.offline":
+			notification.Type = notificationTypeOffline
+		case "channel.update":
+			notification.Type = notificationTypeChannelUpdate
+		default:
+			return oops.New(nil, "unknown subscription type received")
+		}
+	} else if messageType == "revocation" {
+		notification.Type = notificationTypeRevocation
+	}
+
+	if twitchNotificationChannel != nil && notification.Type != notificationTypeNone {
+		select {
+		case twitchNotificationChannel <- notification:
+		default:
+			return oops.New(nil, "twitch notification channel is full")
+		}
+	}
+	return nil
+}
+
+func UserOrProjectLinksUpdated(twitchLoginsPreChange, twitchLoginsPostChange []string) {
+	if linksChangedChannel != nil {
+		twitchChanged := (len(twitchLoginsPreChange) != len(twitchLoginsPostChange))
+		if !twitchChanged {
+			for idx, _ := range twitchLoginsPreChange {
+				if twitchLoginsPreChange[idx] != twitchLoginsPostChange[idx] {
+					twitchChanged = true
+					break
+				}
+			}
+		}
+		select {
+		case linksChangedChannel <- struct{}{}:
+		default:
+		}
+	}
+}
+
+func syncWithTwitch(ctx context.Context, dbConn *pgxpool.Pool, updateAll bool) {
+	log := logging.ExtractLogger(ctx)
+	log.Info().Msg("Running twitch sync")
+	p := perf.MakeNewRequestPerf("Background job", "", "syncWithTwitch")
+	defer func() {
+		p.EndRequest()
+		perf.LogPerf(p, log.Info())
+	}()
+
+	type twitchSyncStats struct {
+		NumSubbed         int
+		NumUnsubbed       int
+		NumStreamsChecked int
+	}
+	var stats twitchSyncStats
+
+	p.StartBlock("SQL", "Fetch list of streamers")
+	streamers, err := hmndata.FetchTwitchStreamers(ctx, dbConn)
+	if err != nil {
+		log.Error().Err(err).Msg("Error while monitoring twitch")
+		return
+	}
+	p.EndBlock()
+
+	needID := make([]string, 0)
+	streamerMap := make(map[string]*hmndata.TwitchStreamer)
+	for idx, streamer := range streamers {
+		needID = append(needID, streamer.TwitchLogin)
+		streamerMap[streamer.TwitchLogin] = &streamers[idx]
+	}
+
+	p.StartBlock("TwitchAPI", "Fetch twitch user info")
+	twitchUsers, err := getTwitchUsersByLogin(ctx, needID)
+	if err != nil {
+		log.Error().Err(err).Msg("Error while monitoring twitch")
+		return
+	}
+	p.EndBlock()
+
+	for _, tu := range twitchUsers {
+		streamerMap[tu.TwitchLogin].TwitchID = tu.TwitchID
+	}
+
+	validStreamers := make([]hmndata.TwitchStreamer, 0, len(streamers))
+	for _, streamer := range streamers {
+		if len(streamer.TwitchID) > 0 {
+			validStreamers = append(validStreamers, streamer)
+		}
+	}
+
+	p.StartBlock("TwitchAPI", "Fetch event subscriptions")
+	subscriptions, err := getEventSubscriptions(ctx)
+	if err != nil {
+		log.Error().Err(err).Msg("Error while monitoring twitch")
+		return
+	}
+	p.EndBlock()
+
+	const (
+		EventSubNone    = 0 // No event of this type found
+		EventSubRefresh = 1 // Event found, but bad status. Need to unsubscribe and resubscribe.
+		EventSubGood    = 2 // All is well.
+	)
+
+	type isSubbedByType map[string]bool
+
+	streamerEventSubs := make(map[string]isSubbedByType)
+	for _, streamer := range validStreamers {
+		streamerEventSubs[streamer.TwitchID] = make(isSubbedByType)
+		streamerEventSubs[streamer.TwitchID]["channel.update"] = false
+		streamerEventSubs[streamer.TwitchID]["stream.online"] = false
+		streamerEventSubs[streamer.TwitchID]["stream.offline"] = false
+	}
+
+	type unsubEvent struct {
+		TwitchID string
+		EventID  string
+	}
+
+	toUnsub := make([]unsubEvent, 0)
+
+	for _, sub := range subscriptions {
+		handled := false
+		if eventSubs, ok := streamerEventSubs[sub.TwitchID]; ok {
+			if _, ok := eventSubs[sub.Type]; ok { // Make sure it's a known type
+				if !sub.GoodStatus {
+					log.Debug().Str("TwitchID", sub.TwitchID).Str("Event Type", sub.Type).Msg("Twitch doesn't like our sub")
+					toUnsub = append(toUnsub, unsubEvent{TwitchID: sub.TwitchID, EventID: sub.EventID})
+				} else {
+					streamerEventSubs[sub.TwitchID][sub.Type] = true
+				}
+				handled = true
+			}
+		}
+		if !handled {
+			// NOTE(asaf): Found an unknown type or an event subscription that we don't have a matching user for.
+			//             Make sure we unsubscribe.
+			toUnsub = append(toUnsub, unsubEvent{TwitchID: sub.TwitchID, EventID: sub.EventID})
+		}
+	}
+
+	if config.Config.Env != config.Dev { // NOTE(asaf): Can't subscribe to events from dev. We need a non-localhost callback url.
+		p.StartBlock("TwitchAPI", "Sync subscriptions with twitch")
+		for _, ev := range toUnsub {
+			err = unsubscribeFromEvent(ctx, ev.EventID)
+			if err != nil {
+				log.Error().Err(err).Msg("Error while unsubscribing events")
+				// NOTE(asaf): Soft error. Don't care if it fails.
+			}
+			stats.NumUnsubbed += 1
+		}
+
+		for twitchID, evStatuses := range streamerEventSubs {
+			for evType, isSubbed := range evStatuses {
+				if !isSubbed {
+					err = subscribeToEvent(ctx, evType, twitchID)
+					if err != nil {
+						log.Error().Err(err).Msg("Error while monitoring twitch")
+						return
+					}
+					stats.NumSubbed += 1
+				}
+			}
+		}
+		p.EndBlock()
+	}
+
+	tx, err := dbConn.Begin(ctx)
+	if err != nil {
+		log.Error().Err(err).Msg("failed to start transaction")
+	}
+	defer tx.Rollback(ctx)
+
+	allIDs := make([]string, 0, len(validStreamers))
+	for _, streamer := range validStreamers {
+		allIDs = append(allIDs, streamer.TwitchID)
+	}
+	p.StartBlock("SQL", "Remove untracked streamers")
+	_, err = tx.Exec(ctx,
+		`DELETE FROM twitch_streams WHERE twitch_id != ANY($1)`,
+		allIDs,
+	)
+	if err != nil {
+		log.Error().Err(err).Msg("Failed to remove untracked twitch ids from streamer list in db")
+		return
+	}
+	p.EndBlock()
+
+	usersToUpdate := make([]string, 0)
+	if updateAll {
+		usersToUpdate = allIDs
+	} else {
+		// NOTE(asaf): Twitch can revoke our subscriptions, so we need to
+		//             update users whose subs were revoked or missing since last time we checked.
+		for twitchID, evStatuses := range streamerEventSubs {
+			for _, isSubbed := range evStatuses {
+				if !isSubbed {
+					usersToUpdate = append(usersToUpdate, twitchID)
+					break
+				}
+			}
+		}
+	}
+
+	p.StartBlock("TwitchAPI", "Fetch twitch stream statuses")
+	statuses, err := getStreamStatus(ctx, usersToUpdate)
+	if err != nil {
+		log.Error().Err(err).Msg("failed to fetch stream statuses")
+		return
+	}
+	p.EndBlock()
+	p.StartBlock("SQL", "Update stream statuses in db")
+	for _, status := range statuses {
+		log.Debug().Interface("Status", status).Msg("Got streamer")
+		_, err = updateStreamStatusInDB(ctx, tx, &status)
+		if err != nil {
+			log.Error().Err(err).Msg("failed to update twitch stream status")
+		}
+	}
+	p.EndBlock()
+	err = tx.Commit(ctx)
+	if err != nil {
+		log.Error().Err(err).Msg("failed to commit transaction")
+	}
+	stats.NumStreamsChecked += len(usersToUpdate)
+	log.Info().Interface("Stats", stats).Msg("Twitch sync done")
+}
+
+func notifyDiscordOfLiveStream(ctx context.Context, dbConn db.ConnOrTx, twitchLogin string, title string) error {
+	var err error
+	if config.Config.Discord.StreamsChannelID != "" {
+		err = discord.SendMessages(ctx, dbConn, discord.MessageToSend{
+			ChannelID: config.Config.Discord.StreamsChannelID,
+			Req: discord.CreateMessageRequest{
+				Content: fmt.Sprintf("%s is live: https://twitch.tv/%s\n> %s", twitchLogin, twitchLogin, title),
+			},
+		})
+	}
+	return err
+}
+
+func processEventSubNotification(ctx context.Context, dbConn db.ConnOrTx, notification *twitchNotification) {
+	log := logging.ExtractLogger(ctx)
+	log.Debug().Interface("Notification", notification).Msg("Processing twitch notification")
+	if notification.Type == notificationTypeNone {
+		return
+	}
+
+	status := streamStatus{
+		TwitchID: notification.TwitchID,
+		Live:     false,
+	}
+	var err error
+	if notification.Type == notificationTypeChannelUpdate || notification.Type == notificationTypeOnline {
+		result, err := getStreamStatus(ctx, []string{notification.TwitchID})
+		if err != nil || len(result) == 0 {
+			log.Error().Str("TwitchID", notification.TwitchID).Err(err).Msg("failed to fetch stream status")
+			return
+		}
+		allStreamers, err := hmndata.FetchTwitchStreamers(ctx, dbConn)
+		if err != nil {
+			log.Error().Err(err).Msg("failed to fetch hmn streamers")
+			return
+		}
+		for _, streamer := range allStreamers {
+			if streamer.TwitchLogin == result[0].TwitchLogin {
+				status = result[0]
+				break
+			}
+		}
+	}
+
+	log.Debug().Interface("Status", status).Msg("Updating status")
+	inserted, err := updateStreamStatusInDB(ctx, dbConn, &status)
+	if err != nil {
+		log.Error().Err(err).Msg("failed to update twitch stream status")
+	}
+	if inserted {
+		log.Debug().Msg("Notifying discord")
+		err = notifyDiscordOfLiveStream(ctx, dbConn, status.TwitchLogin, status.Title)
+		if err != nil {
+			log.Error().Err(err).Msg("failed to notify discord")
+		}
+	}
+}
+
+func updateStreamStatusInDB(ctx context.Context, conn db.ConnOrTx, status *streamStatus) (bool, error) {
+	log := logging.ExtractLogger(ctx)
+	inserted := false
+	if isStatusRelevant(status) {
+		log.Debug().Msg("Status relevant")
+		_, err := db.QueryOne(ctx, conn, models.TwitchStream{},
+			`
+			SELECT $columns
+			FROM twitch_streams
+			WHERE twitch_id = $1
+			`,
+			status.TwitchID,
+		)
+		if err == db.NotFound {
+			log.Debug().Msg("Inserting new stream")
+			inserted = true
+		} else if err != nil {
+			return false, oops.New(err, "failed to query existing stream")
+		}
+		_, err = conn.Exec(ctx,
+			`
+			INSERT INTO twitch_streams (twitch_id, twitch_login, title, started_at)
+				VALUES ($1, $2, $3, $4)
+			ON CONFLICT (twitch_id) DO UPDATE SET
+				title = EXCLUDED.title,
+				started_at = EXCLUDED.started_at
+			`,
+			status.TwitchID,
+			status.TwitchLogin,
+			status.Title,
+			status.StartedAt,
+		)
+		if err != nil {
+			return false, oops.New(err, "failed to insert twitch streamer into db")
+		}
+	} else {
+		log.Debug().Msg("Stream not relevant")
+		_, err := conn.Exec(ctx,
+			`
+			DELETE FROM twitch_streams WHERE twitch_id = $1
+			`,
+			status.TwitchID,
+		)
+		if err != nil {
+			return false, oops.New(err, "failed to remove twitch streamer from db")
+		}
+	}
+	return inserted, nil
+}
+
+var RelevantCategories = []string{
+	"1469308723", // Software and Game Development
+}
+
+var RelevantTags = []string{
+	"a59f1e4e-257b-4bd0-90c7-189c3efbf917", // Programming
+	"6f86127d-6051-4a38-94bb-f7b475dde109", // Software Development
+}
+
+func isStatusRelevant(status *streamStatus) bool {
+	if status.Live {
+		for _, cat := range RelevantCategories {
+			if status.Category == cat {
+				return true
+			}
+		}
+
+		for _, tag := range RelevantTags {
+			for _, streamTag := range status.Tags {
+				if tag == streamTag {
+					return true
+				}
+			}
+		}
+	}
+	return false
+}

src/website/discord.go

@@ -78,6 +78,22 @@ func DiscordOAuthCallback(c *RequestContext) ResponseData {
 		return c.ErrorResponse(http.StatusInternalServerError, oops.New(err, "failed to save new Discord user info"))
 	}
 
+	if c.CurrentUser.Status == models.UserStatusConfirmed {
+		_, err = c.Conn.Exec(c.Context(),
+			`
+			UPDATE auth_user
+			SET status = $1
+			WHERE id = $2
+			`,
+			models.UserStatusApproved,
+			c.CurrentUser.ID,
+		)
+		if err != nil {
+			c.Logger.Error().Err(err).Msg("failed to set user status to approved after linking discord account")
+			// NOTE(asaf): It's not worth failing the request over this, so we're not returning an error to the user.
+		}
+	}
+
 	return c.Redirect(hmnurl.BuildUserSettings("discord"), http.StatusSeeOther)
 }
 

src/website/pagination.go

@@ -3,6 +3,8 @@ package website
 import (
 	"math"
 	"strconv"
+
+	"git.handmade.network/hmn/hmn/src/utils"
 )
 
 func getPageInfo(
@@ -14,7 +16,7 @@ func getPageInfo(
 	totalPages int,
 	ok bool,
 ) {
-	totalPages = int(math.Ceil(float64(totalItems) / float64(itemsPerPage)))
+	totalPages = utils.IntMax(1, int(math.Ceil(float64(totalItems)/float64(itemsPerPage))))
 	ok = true
 
 	page = 1

src/website/pagination_test.go

@@ -0,0 +1,36 @@
+package website
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGetPageInfo(t *testing.T) {
+	items := []struct {
+		name                string
+		pageParam           string
+		totalItems, perPage int
+		page, totalPages    int
+		ok                  bool
+	}{
+		{"good, no param", "", 85, 10, 1, 9, true},
+		{"good", "2", 85, 10, 2, 9, true},
+		{"too big", "10", 85, 10, 0, 0, false},
+		{"too small", "0", 85, 10, 0, 0, false},
+		{"pizza", "pizza", 85, 10, 0, 0, false},
+		{"zero items, no param", "", 0, 10, 1, 1, true}, // should go to page 1
+		{"zero items, page 1", "1", 0, 10, 1, 1, true},
+		{"zero items, too big", "2", 0, 10, 0, 0, false},
+		{"zero items, too small", "0", 0, 10, 0, 0, false},
+	}
+
+	for _, item := range items {
+		t.Run(item.name, func(t *testing.T) {
+			page, totalPages, ok := getPageInfo(item.pageParam, item.totalItems, item.perPage)
+			assert.Equal(t, item.page, page)
+			assert.Equal(t, item.totalPages, totalPages)
+			assert.Equal(t, item.ok, ok)
+		})
+	}
+}

src/website/projects.go

@@ -22,6 +22,7 @@ import (
 	"git.handmade.network/hmn/hmn/src/oops"
 	"git.handmade.network/hmn/hmn/src/parsing"
 	"git.handmade.network/hmn/hmn/src/templates"
+	"git.handmade.network/hmn/hmn/src/twitch"
 	"git.handmade.network/hmn/hmn/src/utils"
 	"github.com/google/uuid"
 	"github.com/jackc/pgx/v4"
@@ -864,6 +865,7 @@ func updateProject(ctx context.Context, tx pgx.Tx, user *models.User, payload *P
 		}
 	}
 
+	twitchLoginsPreChange, preErr := hmndata.FetchTwitchLoginsForUserOrProject(ctx, tx, nil, &payload.ProjectID)
 	_, err = tx.Exec(ctx, `DELETE FROM handmade_links WHERE project_id = $1`, payload.ProjectID)
 	if err != nil {
 		return oops.New(err, "Failed to delete project links")
@@ -883,6 +885,10 @@ func updateProject(ctx context.Context, tx pgx.Tx, user *models.User, payload *P
 			return oops.New(err, "Failed to insert new project link")
 		}
 	}
+	twitchLoginsPostChange, postErr := hmndata.FetchTwitchLoginsForUserOrProject(ctx, tx, nil, &payload.ProjectID)
+	if preErr == nil && postErr == nil {
+		twitch.UserOrProjectLinksUpdated(twitchLoginsPreChange, twitchLoginsPostChange)
+	}
 
 	return nil
 }

src/website/routes.go

@@ -205,6 +205,9 @@ func NewWebsiteRoutes(longRequestContext context.Context, conn *pgxpool.Pool) ht
 	hmnOnly.POST(hmnurl.RegexDiscordUnlink, authMiddleware(csrfMiddleware(DiscordUnlink)))
 	hmnOnly.POST(hmnurl.RegexDiscordShowcaseBacklog, authMiddleware(csrfMiddleware(DiscordShowcaseBacklog)))
 
+	hmnOnly.POST(hmnurl.RegexTwitchEventSubCallback, TwitchEventSubCallback)
+	hmnOnly.GET(hmnurl.RegexTwitchDebugPage, TwitchDebugPage)
+
 	hmnOnly.GET(hmnurl.RegexUserProfile, UserProfile)
 	hmnOnly.GET(hmnurl.RegexUserSettings, authMiddleware(UserSettings))
 	hmnOnly.POST(hmnurl.RegexUserSettings, authMiddleware(csrfMiddleware(UserSettingsSave)))

src/website/staticpages.go

@@ -6,7 +6,7 @@ func Manifesto(c *RequestContext) ResponseData {
 	baseData := getBaseDataAutocrumb(c, "Handmade Manifesto")
 	baseData.OpenGraphItems = append(baseData.OpenGraphItems, templates.OpenGraphItem{
 		Property: "og:description",
-		Value:    "Modern computer hardware is amazing. Manufacturers have orchestrated billions of pieces of silicon into terrifyingly complex and efficient structures…",
+		Value:    "Computers are amazing. So why is software so terrible?",
 	})
 
 	var res ResponseData

src/website/timeline_helper.go

@@ -89,6 +89,8 @@ func SnippetToTimelineItem(
 			item.EmbedMedia = append(item.EmbedMedia, videoMediaItem(asset))
 		} else if strings.HasPrefix(asset.MimeType, "audio/") {
 			item.EmbedMedia = append(item.EmbedMedia, audioMediaItem(asset))
+		} else {
+			item.EmbedMedia = append(item.EmbedMedia, unknownMediaItem(asset))
 		}
 	}
 
@@ -100,7 +102,8 @@ func SnippetToTimelineItem(
 		}
 	}
 
-	if len(item.EmbedMedia) > 0 && (item.EmbedMedia[0].Width == 0 || item.EmbedMedia[0].Height == 0) {
+	if len(item.EmbedMedia) == 0 ||
+		(len(item.EmbedMedia) > 0 && (item.EmbedMedia[0].Width == 0 || item.EmbedMedia[0].Height == 0)) {
 		item.CanShowcase = false
 	}
 
@@ -185,3 +188,15 @@ func youtubeMediaItem(videoId string) templates.TimelineItemMedia {
 		},
 	}
 }
+
+func unknownMediaItem(asset *models.Asset) templates.TimelineItemMedia {
+	assetUrl := hmnurl.BuildS3Asset(asset.S3Key)
+
+	return templates.TimelineItemMedia{
+		Type:     templates.TimelineItemMediaTypeUnknown,
+		AssetUrl: assetUrl,
+		MimeType: asset.MimeType,
+		Filename: asset.Filename,
+		FileSize: asset.Size,
+	}
+}

src/website/twitch.go

@@ -0,0 +1,94 @@
+package website
+
+import (
+	"crypto/hmac"
+	"crypto/sha256"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+
+	"git.handmade.network/hmn/hmn/src/config"
+	"git.handmade.network/hmn/hmn/src/db"
+	"git.handmade.network/hmn/hmn/src/models"
+	"git.handmade.network/hmn/hmn/src/oops"
+	"git.handmade.network/hmn/hmn/src/twitch"
+)
+
+func TwitchEventSubCallback(c *RequestContext) ResponseData {
+	secret := config.Config.Twitch.EventSubSecret
+	messageId := c.Req.Header.Get("Twitch-Eventsub-Message-Id")
+	timestamp := c.Req.Header.Get("Twitch-Eventsub-Message-Timestamp")
+	signature := c.Req.Header.Get("Twitch-Eventsub-Message-Signature")
+	messageType := c.Req.Header.Get("Twitch-Eventsub-Message-Type")
+
+	body, err := io.ReadAll(c.Req.Body)
+	if err != nil {
+		return c.ErrorResponse(http.StatusInternalServerError, oops.New(err, "failed to read request body"))
+	}
+
+	hmacMessage := fmt.Sprintf("%s%s%s", messageId, timestamp, string(body[:]))
+	hmac := hmac.New(sha256.New, []byte(secret))
+	hmac.Write([]byte(hmacMessage))
+	hash := hmac.Sum(nil)
+	hmacStr := "sha256=" + hex.EncodeToString(hash)
+
+	if hmacStr != signature {
+		var res ResponseData
+		res.StatusCode = 403
+		return res
+	}
+
+	c.Logger.Debug().Str("Body", string(body[:])).Str("Type", messageType).Msg("Got twitch webhook")
+
+	if messageType == "webhook_callback_verification" {
+		type challengeReq struct {
+			Challenge string `json:"challenge"`
+		}
+		var data challengeReq
+		err = json.Unmarshal(body, &data)
+		if err != nil {
+			return c.ErrorResponse(http.StatusInternalServerError, oops.New(err, "failed to unmarshal twitch verification"))
+		}
+		var res ResponseData
+		res.StatusCode = 200
+
+		res.Header().Set("Content-Type", "text/plain") // NOTE(asaf): No idea why, but the twitch-cli fails when we don't set this.
+		res.Write([]byte(data.Challenge))
+		return res
+	} else {
+		err := twitch.QueueTwitchNotification(messageType, body)
+		if err != nil {
+			c.Logger.Error().Err(err).Msg("Failed to process twitch callback")
+			// NOTE(asaf): Returning 200 either way here
+		}
+		var res ResponseData
+		res.StatusCode = 200
+		return res
+	}
+}
+
+func TwitchDebugPage(c *RequestContext) ResponseData {
+	streams, err := db.Query(c.Context(), c.Conn, models.TwitchStream{},
+		`
+		SELECT $columns
+		FROM
+			twitch_streams
+		ORDER BY started_at DESC
+		`,
+	)
+	if err != nil {
+		return c.ErrorResponse(http.StatusInternalServerError, oops.New(err, "failed to fetch twitch streams"))
+	}
+
+	html := ""
+	for _, stream := range streams {
+		s := stream.(*models.TwitchStream)
+		html += fmt.Sprintf(`<a href="https://twitch.tv/%s">%s</a>%s<br />`, s.Login, s.Login, s.Title)
+	}
+	var res ResponseData
+	res.StatusCode = 200
+	res.Write([]byte(html))
+	return res
+}

src/website/user.go

@@ -18,6 +18,7 @@ import (
 	"git.handmade.network/hmn/hmn/src/models"
 	"git.handmade.network/hmn/hmn/src/oops"
 	"git.handmade.network/hmn/hmn/src/templates"
+	"git.handmade.network/hmn/hmn/src/twitch"
 	"github.com/google/uuid"
 	"github.com/jackc/pgx/v4"
 )
@@ -378,6 +379,7 @@ func UserSettingsSave(c *RequestContext) ResponseData {
 	}
 
 	// Process links
+	twitchLoginsPreChange, preErr := hmndata.FetchTwitchLoginsForUserOrProject(c.Context(), tx, &c.CurrentUser.ID, nil)
 	linksText := form.Get("links")
 	links := ParseLinks(linksText)
 	_, err = tx.Exec(c.Context(), `DELETE FROM handmade_links WHERE user_id = $1`, c.CurrentUser.ID)
@@ -401,6 +403,10 @@ func UserSettingsSave(c *RequestContext) ResponseData {
 			}
 		}
 	}
+	twitchLoginsPostChange, postErr := hmndata.FetchTwitchLoginsForUserOrProject(c.Context(), tx, &c.CurrentUser.ID, nil)
+	if preErr == nil && postErr == nil {
+		twitch.UserOrProjectLinksUpdated(twitchLoginsPreChange, twitchLoginsPostChange)
+	}
 
 	// Update password
 	oldPassword := form.Get("old_password")

src/website/website.go

@@ -17,6 +17,7 @@ import (
 	"git.handmade.network/hmn/hmn/src/logging"
 	"git.handmade.network/hmn/hmn/src/perf"
 	"git.handmade.network/hmn/hmn/src/templates"
+	"git.handmade.network/hmn/hmn/src/twitch"
 	"github.com/spf13/cobra"
 )
 
@@ -46,6 +47,7 @@ var WebsiteCommand = &cobra.Command{
 			perfCollector.Done,
 			discord.RunDiscordBot(backgroundJobContext, conn),
 			discord.RunHistoryWatcher(backgroundJobContext, conn),
+			twitch.MonitorTwitchSubscriptions(backgroundJobContext, conn),
 		)
 
 		signals := make(chan os.Signal, 1)