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	Make backend code respond correct JSON when creating PR (#25353)
Fix #25351
This commit is contained in:
		@@ -37,7 +37,6 @@ import (
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	"code.gitea.io/gitea/modules/upload"
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	"code.gitea.io/gitea/modules/util"
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	"code.gitea.io/gitea/modules/web"
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	"code.gitea.io/gitea/modules/web/middleware"
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	"code.gitea.io/gitea/routers/utils"
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	asymkey_service "code.gitea.io/gitea/services/asymkey"
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	"code.gitea.io/gitea/services/automerge"
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@@ -1206,36 +1205,12 @@ func CompareAndPullRequestPost(ctx *context.Context) {
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	}
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	if ctx.HasError() {
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		middleware.AssignForm(form, ctx.Data)
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		// This stage is already stop creating new pull request, so it does not matter if it has
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		// something to compare or not.
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		PrepareCompareDiff(ctx, ci,
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			gitdiff.GetWhitespaceFlag(ctx.Data["WhitespaceBehavior"].(string)))
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		if ctx.Written() {
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			return
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		}
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		if len(form.Title) > 255 {
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			var trailer string
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			form.Title, trailer = util.SplitStringAtByteN(form.Title, 255)
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			form.Content = trailer + "\n\n" + form.Content
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		}
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		middleware.AssignForm(form, ctx.Data)
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		ctx.HTML(http.StatusOK, tplCompareDiff)
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		ctx.JSONError(ctx.GetErrMsg())
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		return
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	}
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	if util.IsEmptyString(form.Title) {
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		PrepareCompareDiff(ctx, ci,
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			gitdiff.GetWhitespaceFlag(ctx.Data["WhitespaceBehavior"].(string)))
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		if ctx.Written() {
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			return
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		}
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		ctx.RenderWithErr(ctx.Tr("repo.issues.new.title_empty"), tplCompareDiff, form)
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		ctx.JSONError(ctx.Tr("repo.issues.new.title_empty"))
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		return
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	}
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@@ -1278,20 +1253,20 @@ func CompareAndPullRequestPost(ctx *context.Context) {
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			pushrejErr := err.(*git.ErrPushRejected)
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			message := pushrejErr.Message
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			if len(message) == 0 {
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				ctx.Flash.Error(ctx.Tr("repo.pulls.push_rejected_no_message"))
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			} else {
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				flashError, err := ctx.RenderToString(tplAlertDetails, map[string]interface{}{
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					"Message": ctx.Tr("repo.pulls.push_rejected"),
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					"Summary": ctx.Tr("repo.pulls.push_rejected_summary"),
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					"Details": utils.SanitizeFlashErrorString(pushrejErr.Message),
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				})
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				if err != nil {
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					ctx.ServerError("CompareAndPullRequest.HTMLString", err)
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					return
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				}
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				ctx.Flash.Error(flashError)
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				ctx.JSONError(ctx.Tr("repo.pulls.push_rejected_no_message"))
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				return
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			}
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			ctx.Redirect(pullIssue.Link())
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			flashError, err := ctx.RenderToString(tplAlertDetails, map[string]interface{}{
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				"Message": ctx.Tr("repo.pulls.push_rejected"),
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				"Summary": ctx.Tr("repo.pulls.push_rejected_summary"),
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				"Details": utils.SanitizeFlashErrorString(pushrejErr.Message),
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			})
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			if err != nil {
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				ctx.ServerError("CompareAndPullRequest.HTMLString", err)
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				return
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			}
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			ctx.Flash.Error(flashError)
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			ctx.JSONRedirect(pullIssue.Link()) // FIXME: it's unfriendly, and will make the content lost
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			return
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		}
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		ctx.ServerError("NewPullRequest", err)
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@@ -1299,7 +1274,7 @@ func CompareAndPullRequestPost(ctx *context.Context) {
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	}
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	log.Trace("Pull request created: %d/%d", repo.ID, pullIssue.ID)
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	ctx.Redirect(pullIssue.Link())
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	ctx.JSONRedirect(pullIssue.Link())
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}
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// CleanUpPullRequest responses for delete merged branch when PR has been merged
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