Add API endpoint to get changed files of a PR

modules/convert/convert.go

@@ -23,6 +23,7 @@ import (
 	"code.gitea.io/gitea/modules/log"
 	api "code.gitea.io/gitea/modules/structs"
 	"code.gitea.io/gitea/modules/util"
+	"code.gitea.io/gitea/services/gitdiff"
 	webhook_service "code.gitea.io/gitea/services/webhook"
 )
 
@@ -372,3 +373,10 @@ func ToLFSLock(l *models.LFSLock) *api.LFSLock {
 		},
 	}
 }
+
+// ToChangedFile convert a gitdiff.DiffFile to api.ChangedFile
+func ToChangedFile(f *gitdiff.DiffFile) *api.ChangedFile {
+	return &api.ChangedFile{
+		Filename: f.Name,
+	}
+}

modules/structs/pull.go

@@ -93,3 +93,8 @@ type EditPullRequestOption struct {
 	Deadline       *time.Time `json:"due_date"`
 	RemoveDeadline *bool      `json:"unset_due_date"`
 }
+
+// ChangedFile store information about files affected by the pull request
+type ChangedFile struct {
+	Filename string `json:"filename"`
+}

routers/api/v1/api.go

@@ -930,6 +930,7 @@ func Routes(sessioner func(http.Handler) http.Handler) *web.Route {
 						m.Get(".{diffType:diff|patch}", repo.DownloadPullDiffOrPatch)
 						m.Post("/update", reqToken(), repo.UpdatePullRequest)
 						m.Get("/commits", repo.GetPullRequestCommits)
+						m.Get("/files", repo.GetPullRequestFiles)
 						m.Combo("/merge").Get(repo.IsPullRequestMerged).
 							Post(reqToken(), mustNotBeArchived, bind(forms.MergePullRequestForm{}), repo.MergePullRequest)
 						m.Group("/reviews", func() {

routers/api/v1/repo/pull.go

@@ -22,12 +22,14 @@ import (
 	"code.gitea.io/gitea/modules/git"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/notification"
+	"code.gitea.io/gitea/modules/setting"
 	api "code.gitea.io/gitea/modules/structs"
 	"code.gitea.io/gitea/modules/timeutil"
 	"code.gitea.io/gitea/modules/web"
 	"code.gitea.io/gitea/routers/api/v1/utils"
 	asymkey_service "code.gitea.io/gitea/services/asymkey"
 	"code.gitea.io/gitea/services/forms"
+	"code.gitea.io/gitea/services/gitdiff"
 	issue_service "code.gitea.io/gitea/services/issue"
 	pull_service "code.gitea.io/gitea/services/pull"
 	repo_service "code.gitea.io/gitea/services/repository"
@@ -1255,3 +1257,128 @@ func GetPullRequestCommits(ctx *context.APIContext) {
 
 	ctx.JSON(http.StatusOK, &apiCommits)
 }
+
+// GetPullRequestFiles gets all changed files associated with a given PR
+func GetPullRequestFiles(ctx *context.APIContext) {
+	// swagger:operation GET /repos/{owner}/{repo}/pulls/{index}/files repository repoGetPullRequestFiles
+	// ---
+	// summary: Get changed files for a pull request
+	// produces:
+	// - application/json
+	// parameters:
+	// - name: owner
+	//   in: path
+	//   description: owner of the repo
+	//   type: string
+	//   required: true
+	// - name: repo
+	//   in: path
+	//   description: name of the repo
+	//   type: string
+	//   required: true
+	// - name: index
+	//   in: path
+	//   description: index of the pull request to get
+	//   type: integer
+	//   format: int64
+	//   required: true
+	// - name: page
+	//   in: query
+	//   description: page number of results to return (1-based)
+	//   type: integer
+	// - name: limit
+	//   in: query
+	//   description: page size of results
+	//   type: integer
+	// responses:
+	//   "200":
+	//     "$ref": "#/responses/ChangedFileList"
+	//   "404":
+	//     "$ref": "#/responses/notFound"
+
+	pr, err := models.GetPullRequestByIndex(ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))
+	if err != nil {
+		if models.IsErrPullRequestNotExist(err) {
+			ctx.NotFound()
+		} else {
+			ctx.Error(http.StatusInternalServerError, "GetPullRequestByIndex", err)
+		}
+		return
+	}
+
+	if err := pr.LoadBaseRepo(); err != nil {
+		ctx.InternalServerError(err)
+		return
+	}
+
+	var prInfo *git.CompareInfo
+	baseGitRepo, err := git.OpenRepository(pr.BaseRepo.RepoPath())
+	if err != nil {
+		ctx.ServerError("OpenRepository", err)
+		return
+	}
+	defer baseGitRepo.Close()
+	if pr.HasMerged {
+		prInfo, err = baseGitRepo.GetCompareInfo(pr.BaseRepo.RepoPath(), pr.MergeBase, pr.GetGitRefName(), true, false)
+	} else {
+		prInfo, err = baseGitRepo.GetCompareInfo(pr.BaseRepo.RepoPath(), pr.BaseBranch, pr.GetGitRefName(), true, false)
+	}
+	if err != nil {
+		ctx.ServerError("GetCompareInfo", err)
+		return
+	}
+
+	headCommitID, err := baseGitRepo.GetRefCommitID(pr.GetGitRefName())
+	if err != nil {
+		ctx.ServerError("GetRefCommitID", err)
+		return
+	}
+
+	startCommitID := prInfo.MergeBase
+	endCommitID := headCommitID
+
+	maxLines, maxFiles := setting.Git.MaxGitDiffLines, setting.Git.MaxGitDiffFiles
+
+	diff, err := gitdiff.GetDiff(baseGitRepo,
+		&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")...)
+	if err != nil {
+		ctx.ServerError("GetDiffRangeWithWhitespaceBehavior", err)
+		return
+	}
+
+	listOptions := utils.GetListOptions(ctx)
+
+	totalNumberOfFiles := diff.NumFiles
+	totalNumberOfPages := int(math.Ceil(float64(totalNumberOfFiles) / float64(listOptions.PageSize)))
+
+	start, end := listOptions.GetStartEnd()
+
+	if end > totalNumberOfFiles {
+		end = totalNumberOfFiles
+	}
+
+	apiFiles := make([]*api.ChangedFile, 0, end-start)
+	for i := start; i < end; i++ {
+		apiFile := convert.ToChangedFile(diff.Files[i])
+		apiFiles = append(apiFiles, apiFile)
+	}
+
+	ctx.SetLinkHeader(totalNumberOfFiles, listOptions.PageSize)
+	ctx.SetTotalCountHeader(int64(totalNumberOfFiles))
+
+	ctx.RespHeader().Set("X-Page", strconv.Itoa(listOptions.Page))
+	ctx.RespHeader().Set("X-PerPage", strconv.Itoa(listOptions.PageSize))
+	ctx.RespHeader().Set("X-PageCount", strconv.Itoa(totalNumberOfPages))
+	ctx.RespHeader().Set("X-HasMore", strconv.FormatBool(listOptions.Page < totalNumberOfPages))
+	ctx.AppendAccessControlExposeHeaders("X-Page", "X-PerPage", "X-PageCount", "X-HasMore")
+
+	ctx.JSON(http.StatusOK, &apiFiles)
+}

routers/api/v1/swagger/repo.go

@@ -254,6 +254,28 @@ type swaggerCommitList struct {
 	Body []api.Commit `json:"body"`
 }
 
+// ChangedFileList
+// swagger:response ChangedFileList
+type swaggerChangedFileList struct {
+	// The current page
+	Page int `json:"X-Page"`
+
+	// Commits per page
+	PerPage int `json:"X-PerPage"`
+
+	// Total commit count
+	Total int `json:"X-Total"`
+
+	// Total number of pages
+	PageCount int `json:"X-PageCount"`
+
+	// True if there is another page
+	HasMore bool `json:"X-HasMore"`
+
+	// in: body
+	Files []api.ChangedFile `json:"files"`
+}
+
 // Note
 // swagger:response Note
 type swaggerNote struct {

templates/swagger/v1_json.tmpl

@@ -7567,6 +7567,62 @@
         }
       }
     },
+    "/repos/{owner}/{repo}/pulls/{index}/files": {
+      "get": {
+        "produces": [
+          "application/json"
+        ],
+        "tags": [
+          "repository"
+        ],
+        "summary": "Get changed files for a pull request",
+        "operationId": "repoGetPullRequestFiles",
+        "parameters": [
+          {
+            "type": "string",
+            "description": "owner of the repo",
+            "name": "owner",
+            "in": "path",
+            "required": true
+          },
+          {
+            "type": "string",
+            "description": "name of the repo",
+            "name": "repo",
+            "in": "path",
+            "required": true
+          },
+          {
+            "type": "integer",
+            "format": "int64",
+            "description": "index of the pull request to get",
+            "name": "index",
+            "in": "path",
+            "required": true
+          },
+          {
+            "type": "integer",
+            "description": "page number of results to return (1-based)",
+            "name": "page",
+            "in": "query"
+          },
+          {
+            "type": "integer",
+            "description": "page size of results",
+            "name": "limit",
+            "in": "query"
+          }
+        ],
+        "responses": {
+          "200": {
+            "$ref": "#/responses/ChangedFileList"
+          },
+          "404": {
+            "$ref": "#/responses/notFound"
+          }
+        }
+      }
+    },
     "/repos/{owner}/{repo}/pulls/{index}/merge": {
       "get": {
         "produces": [
@@ -12914,6 +12970,17 @@
       },
       "x-go-package": "code.gitea.io/gitea/modules/structs"
     },
+    "ChangedFile": {
+      "description": "ChangedFile store information about files affected by the pull request",
+      "type": "object",
+      "properties": {
+        "filename": {
+          "type": "string",
+          "x-go-name": "Filename"
+        }
+      },
+      "x-go-package": "code.gitea.io/gitea/modules/structs"
+    },
     "CombinedStatus": {
       "description": "CombinedStatus holds the combined state of several statuses for a single commit",
       "type": "object",
@@ -18186,6 +18253,41 @@
         }
       }
     },
+    "ChangedFileList": {
+      "description": "ChangedFileList",
+      "schema": {
+        "type": "array",
+        "items": {
+          "$ref": "#/definitions/ChangedFile"
+        }
+      },
+      "headers": {
+        "X-HasMore": {
+          "type": "boolean",
+          "description": "True if there is another page"
+        },
+        "X-Page": {
+          "type": "integer",
+          "format": "int64",
+          "description": "The current page"
+        },
+        "X-PageCount": {
+          "type": "integer",
+          "format": "int64",
+          "description": "Total number of pages"
+        },
+        "X-PerPage": {
+          "type": "integer",
+          "format": "int64",
+          "description": "Commits per page"
+        },
+        "X-Total": {
+          "type": "integer",
+          "format": "int64",
+          "description": "Total commit count"
+        }
+      }
+    },
     "CombinedStatus": {
       "description": "CombinedStatus",
       "schema": {