94 lines
2.5 KiB
Go
94 lines
2.5 KiB
Go
package website
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import (
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"crypto/sha1"
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"encoding/hex"
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"errors"
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"fmt"
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"image"
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"io"
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"net/http"
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"os"
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"git.handmade.network/hmn/hmn/src/db"
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"git.handmade.network/hmn/hmn/src/oops"
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)
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// If a helper method returns this, you should call RejectRequest with the value.
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type RejectRequestError error
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/*
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Reads an image file from form data and saves it to the filesystem and the database.
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If the file doesn't exist, this does nothing.
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NOTE(ben): Someday we should replace this with the asset system.
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*/
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func SaveImageFile(c *RequestContext, dbConn db.ConnOrTx, fileFieldName string, maxSize int64, filepath string) (imageFileId int, err error) {
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img, header, err := c.Req.FormFile(fileFieldName)
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filename := ""
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width := 0
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height := 0
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if err != nil && !errors.Is(err, http.ErrMissingFile) {
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return 0, oops.New(err, "failed to read uploaded file")
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}
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if header != nil {
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if header.Size > maxSize {
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return 0, RejectRequestError(fmt.Errorf("Image filesize too big. Max size: %d bytes", maxSize))
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} else {
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c.Perf.StartBlock("IMAGE", "Decoding image")
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config, format, err := image.DecodeConfig(img)
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c.Perf.EndBlock()
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if err != nil {
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return 0, RejectRequestError(errors.New("Image type not supported"))
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}
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width = config.Width
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height = config.Height
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if width == 0 || height == 0 {
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return 0, RejectRequestError(errors.New("Image has zero size"))
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}
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filename = fmt.Sprintf("%s.%s", filepath, format)
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storageFilename := fmt.Sprintf("public/media/%s", filename)
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c.Perf.StartBlock("IMAGE", "Writing image file")
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file, err := os.Create(storageFilename)
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if err != nil {
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return 0, oops.New(err, "Failed to create local image file")
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}
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img.Seek(0, io.SeekStart)
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_, err = io.Copy(file, img)
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if err != nil {
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return 0, oops.New(err, "Failed to write image to file")
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}
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file.Close()
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img.Close()
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c.Perf.EndBlock()
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}
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}
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c.Perf.EndBlock()
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c.Perf.StartBlock("SQL", "Saving image file")
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if filename != "" {
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hasher := sha1.New()
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img.Seek(0, io.SeekStart)
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io.Copy(hasher, img) // NOTE(asaf): Writing to hash.Hash never returns an error according to the docs
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sha1sum := hasher.Sum(nil)
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var imageId int
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err = dbConn.QueryRow(c.Context(),
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`
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INSERT INTO handmade_imagefile (file, size, sha1sum, protected, width, height)
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VALUES ($1, $2, $3, $4, $5, $6)
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RETURNING id
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`,
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filename, header.Size, hex.EncodeToString(sha1sum), false, width, height,
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).Scan(&imageId)
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if err != nil {
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return 0, oops.New(err, "Failed to insert image file row")
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}
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return imageId, nil
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}
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return 0, nil
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}
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