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78fb01c223
But not using it as some linters are either plain incorrect (the one suggesting to not use nil for `c.t.Context()`) or just debatable (checking for err value is a good practice, but there are good reasons to opt out in some cases).
100 lines
2.6 KiB
Go
100 lines
2.6 KiB
Go
// SPDX-FileCopyrightText: 2022 Free Mobile
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// SPDX-License-Identifier: AGPL-3.0-only
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package authentication
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import (
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"bufio"
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"embed"
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"fmt"
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"hash/fnv"
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"image"
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"image/draw"
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"image/png"
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"io/fs"
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"math/rand"
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"net/http"
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"github.com/gin-gonic/gin"
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)
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//go:embed data/avatars
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var avatarParts embed.FS
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// UserInfoHandlerFunc returns the information about the currently logged user.
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func (c *Component) UserInfoHandlerFunc(gc *gin.Context) {
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info := gc.MustGet("user").(UserInformation)
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gc.JSON(http.StatusOK, info)
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}
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// UserAvatarHandlerFunc returns an avatar for the currently logger user.
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func (c *Component) UserAvatarHandlerFunc(gc *gin.Context) {
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// Hash user login as a source
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info := gc.MustGet("user").(UserInformation)
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hash := fnv.New64()
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hash.Write([]byte(info.Login))
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randSource := rand.New(rand.NewSource(int64(hash.Sum64())))
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etag := fmt.Sprintf(`"%x"`, hash.Sum64())
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// Do we have a If-None-Match header?
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if header := gc.GetHeader("If-None-Match"); header == etag {
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gc.Header("ETag", etag)
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gc.Status(http.StatusNotModified)
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return
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}
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// Grab list of parts
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parts := []string{}
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partList, err := avatarParts.Open("data/avatars/partlist.txt")
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if err != nil {
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c.r.Err(err).Msg("cannot open partlist.txt")
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gc.JSON(http.StatusInternalServerError, gin.H{"message": "Cannot build avatar."})
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return
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}
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defer partList.Close()
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scanner := bufio.NewScanner(partList)
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for scanner.Scan() {
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parts = append(parts, scanner.Text())
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}
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// Choose an image for each part
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for idx, part := range parts {
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// Choose a file for each part
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p, _ := fs.Glob(avatarParts, fmt.Sprintf("data/avatars/%s_*", part))
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if len(p) == 0 {
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c.r.Error().Msgf("missing part %s", part)
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gc.JSON(http.StatusInternalServerError, gin.H{"message": "Cannot build avatar."})
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return
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}
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parts[idx] = p[randSource.Intn(len(p))]
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}
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// Compose the images
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var img *image.RGBA
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for _, part := range parts {
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filePart, err := avatarParts.Open(part)
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if err != nil {
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c.r.Err(err).Msgf("cannot open part %s", part)
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gc.JSON(http.StatusInternalServerError, gin.H{"message": "Cannot build avatar."})
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return
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}
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imgPart, err := png.Decode(filePart)
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filePart.Close()
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if err != nil {
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c.r.Err(err).Msgf("cannot decode part %s", part)
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gc.JSON(http.StatusInternalServerError, gin.H{"message": "Cannot build avatar."})
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return
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}
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if img == nil {
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img = image.NewRGBA(imgPart.Bounds())
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}
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draw.Draw(img, img.Bounds(), imgPart, imgPart.Bounds().Min, draw.Over)
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}
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// Serve the result
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gc.Header("Content-Type", "image/png")
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gc.Header("ETag", etag)
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gc.Status(http.StatusOK)
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png.Encode(gc.Writer, img)
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}
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