Make Release Download URLs predictable

models/repo/attachment.go

@@ -18,17 +18,18 @@ import (
 
 // Attachment represent a attachment of issue/comment/release.
 type Attachment struct {
-	ID            int64  `xorm:"pk autoincr"`
-	UUID          string `xorm:"uuid UNIQUE"`
-	RepoID        int64  `xorm:"INDEX"`           // this should not be zero
-	IssueID       int64  `xorm:"INDEX"`           // maybe zero when creating
-	ReleaseID     int64  `xorm:"INDEX"`           // maybe zero when creating
-	UploaderID    int64  `xorm:"INDEX DEFAULT 0"` // Notice: will be zero before this column added
-	CommentID     int64
-	Name          string
-	DownloadCount int64              `xorm:"DEFAULT 0"`
-	Size          int64              `xorm:"DEFAULT 0"`
-	CreatedUnix   timeutil.TimeStamp `xorm:"created"`
+	ID                int64  `xorm:"pk autoincr"`
+	UUID              string `xorm:"uuid UNIQUE"`
+	RepoID            int64  `xorm:"INDEX"`           // this should not be zero
+	IssueID           int64  `xorm:"INDEX"`           // maybe zero when creating
+	ReleaseID         int64  `xorm:"INDEX"`           // maybe zero when creating
+	UploaderID        int64  `xorm:"INDEX DEFAULT 0"` // Notice: will be zero before this column added
+	CommentID         int64
+	Name              string
+	DownloadCount     int64              `xorm:"DEFAULT 0"`
+	Size              int64              `xorm:"DEFAULT 0"`
+	CreatedUnix       timeutil.TimeStamp `xorm:"created"`
+	CustomDownloadURL string             `xorm:"-"`
 }
 
 func init() {
@@ -57,6 +58,10 @@ func (a *Attachment) RelativePath() string {
 
 // DownloadURL returns the download url of the attached file
 func (a *Attachment) DownloadURL() string {
+	if a.CustomDownloadURL != "" {
+		return a.CustomDownloadURL
+	}
+
 	return setting.AppURL + "attachments/" + url.PathEscape(a.UUID)
 }
 

models/repo/release.go

@@ -7,6 +7,7 @@ package repo
 import (
 	"context"
 	"fmt"
+	"net/url"
 	"sort"
 	"strconv"
 	"strings"
@@ -372,6 +373,34 @@ func GetReleaseAttachments(ctx context.Context, rels ...*Release) (err error) {
 		sortedRels.Rel[currentIndex].Attachments = append(sortedRels.Rel[currentIndex].Attachments, attachment)
 	}
 
+	// Makes URL's predictable
+	for _, release := range rels {
+		// If we have no Repo, we don't need to execute this loop
+		if release.Repo == nil {
+			continue
+		}
+
+		// Check if there are two or more attachments with the same name
+		hasDuplicates := false
+		foundNames := make(map[string]bool)
+		for _, attachment := range release.Attachments {
+			_, found := foundNames[attachment.Name]
+			if found {
+				hasDuplicates = true
+				break
+			} else {
+				foundNames[attachment.Name] = true
+			}
+		}
+
+		// If the names unique, use the URL with the Name instead of the UUID
+		if !hasDuplicates {
+			for _, attachment := range release.Attachments {
+				attachment.CustomDownloadURL = release.Repo.HTMLURL() + "/releases/download/" + url.PathEscape(release.TagName) + "/" + url.PathEscape(attachment.Name)
+			}
+		}
+	}
+
 	return err
 }
 

routers/web/repo/attachment.go

@@ -86,9 +86,9 @@ func DeleteAttachment(ctx *context.Context) {
 	})
 }
 
-// GetAttachment serve attachments
-func GetAttachment(ctx *context.Context) {
-	attach, err := repo_model.GetAttachmentByUUID(ctx, ctx.Params(":uuid"))
+// GetAttachment serve attachments with the given UUID
+func ServeAttachment(ctx *context.Context, uuid string) {
+	attach, err := repo_model.GetAttachmentByUUID(ctx, uuid)
 	if err != nil {
 		if repo_model.IsErrAttachmentNotExist(err) {
 			ctx.Error(http.StatusNotFound)
@@ -153,3 +153,8 @@ func GetAttachment(ctx *context.Context) {
 		return
 	}
 }
+
+// GetAttachment serve attachments
+func GetAttachment(ctx *context.Context) {
+	ServeAttachment(ctx, ctx.Params(":uuid"))
+}

routers/web/repo/release.go

@@ -142,6 +142,10 @@ func releasesOrTags(ctx *context.Context, isTagList bool) {
 		return
 	}
 
+	for _, release := range releases {
+		release.Repo = ctx.Repo.Repository
+	}
+
 	if err = repo_model.GetReleaseAttachments(ctx, releases...); err != nil {
 		ctx.ServerError("GetReleaseAttachments", err)
 		return
@@ -248,6 +252,8 @@ func SingleRelease(ctx *context.Context) {
 		ctx.Data["Title"] = release.Title
 	}
 
+	release.Repo = ctx.Repo.Repository
+
 	err = repo_model.GetReleaseAttachments(ctx, release)
 	if err != nil {
 		ctx.ServerError("GetReleaseAttachments", err)

routers/web/repo/repo.go

@@ -373,7 +373,7 @@ func RedirectDownload(ctx *context.Context) {
 			return
 		}
 		if att != nil {
-			ctx.Redirect(att.DownloadURL())
+			ServeAttachment(ctx, att.UUID)
 			return
 		}
 	}