Allow to mark files in a PR as viewed (#19007)

Users can now mark files in PRs as viewed, resulting in them not being shown again by default when they reopen the PR again.

routers/web/repo/pull.go

@@ -685,22 +685,35 @@ func ViewPullFiles(ctx *context.Context) {
 	if fileOnly && (len(files) == 2 || len(files) == 1) {
 		maxLines, maxFiles = -1, -1
 	}
+	diffOptions := &gitdiff.DiffOptions{
+		BeforeCommitID:     startCommitID,
+		AfterCommitID:      endCommitID,
+		SkipTo:             ctx.FormString("skip-to"),
+		MaxLines:           maxLines,
+		MaxLineCharacters:  setting.Git.MaxGitDiffLineCharacters,
+		MaxFiles:           maxFiles,
+		WhitespaceBehavior: gitdiff.GetWhitespaceFlag(ctx.Data["WhitespaceBehavior"].(string)),
+	}
 
-	diff, err := gitdiff.GetDiff(gitRepo,
-		&gitdiff.DiffOptions{
-			BeforeCommitID:     startCommitID,
-			AfterCommitID:      endCommitID,
-			SkipTo:             ctx.FormString("skip-to"),
-			MaxLines:           maxLines,
-			MaxLineCharacters:  setting.Git.MaxGitDiffLineCharacters,
-			MaxFiles:           maxFiles,
-			WhitespaceBehavior: gitdiff.GetWhitespaceFlag(ctx.Data["WhitespaceBehavior"].(string)),
-		}, ctx.FormStrings("files")...)
+	var methodWithError string
+	var diff *gitdiff.Diff
+	if !ctx.IsSigned {
+		diff, err = gitdiff.GetDiff(gitRepo, diffOptions, files...)
+		methodWithError = "GetDiff"
+	} else {
+		diff, err = gitdiff.SyncAndGetUserSpecificDiff(ctx, ctx.Doer.ID, pull, gitRepo, diffOptions, files...)
+		methodWithError = "SyncAndGetUserSpecificDiff"
+	}
 	if err != nil {
-		ctx.ServerError("GetDiffRangeWithWhitespaceBehavior", err)
+		ctx.ServerError(methodWithError, err)
 		return
 	}
 
+	ctx.PageData["prReview"] = map[string]interface{}{
+		"numberOfFiles":       diff.NumFiles,
+		"numberOfViewedFiles": diff.NumViewedFiles,
+	}
+
 	if err = diff.LoadComments(ctx, issue, ctx.Doer); err != nil {
 		ctx.ServerError("LoadComments", err)
 		return

routers/web/repo/pull_review.go

@@ -9,8 +9,10 @@ import (
 	"net/http"
 
 	"code.gitea.io/gitea/models"
+	pull_model "code.gitea.io/gitea/models/pull"
 	"code.gitea.io/gitea/modules/base"
 	"code.gitea.io/gitea/modules/context"
+	"code.gitea.io/gitea/modules/json"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/web"
@@ -242,3 +244,47 @@ func DismissReview(ctx *context.Context) {
 
 	ctx.Redirect(fmt.Sprintf("%s/pulls/%d#%s", ctx.Repo.RepoLink, comm.Issue.Index, comm.HashTag()))
 }
+
+// viewedFilesUpdate Struct to parse the body of a request to update the reviewed files of a PR
+// If you want to implement an API to update the review, simply move this struct into modules.
+type viewedFilesUpdate struct {
+	Files         map[string]bool `json:"files"`
+	HeadCommitSHA string          `json:"headCommitSHA"`
+}
+
+func UpdateViewedFiles(ctx *context.Context) {
+	// Find corresponding PR
+	issue := checkPullInfo(ctx)
+	if ctx.Written() {
+		return
+	}
+	pull := issue.PullRequest
+
+	var data *viewedFilesUpdate
+	err := json.NewDecoder(ctx.Req.Body).Decode(&data)
+	if err != nil {
+		log.Warn("Attempted to update a review but could not parse request body: %v", err)
+		ctx.Resp.WriteHeader(http.StatusBadRequest)
+		return
+	}
+
+	// Expect the review to have been now if no head commit was supplied
+	if data.HeadCommitSHA == "" {
+		data.HeadCommitSHA = pull.HeadCommitID
+	}
+
+	updatedFiles := make(map[string]pull_model.ViewedState, len(data.Files))
+	for file, viewed := range data.Files {
+
+		// Only unviewed and viewed are possible, has-changed can not be set from the outside
+		state := pull_model.Unviewed
+		if viewed {
+			state = pull_model.Viewed
+		}
+		updatedFiles[file] = state
+	}
+
+	if err := pull_model.UpdateReviewState(ctx, ctx.Doer.ID, pull.ID, data.HeadCommitSHA, updatedFiles); err != nil {
+		ctx.ServerError("UpdateReview", err)
+	}
+}