add get procfile handler

api/server/handlers/gitinstallation/get_procfile.go

@@ -0,0 +1,97 @@
+package gitinstallation
+
+import (
+	"context"
+	"net/http"
+	"regexp"
+	"strings"
+
+	"github.com/google/go-github/github"
+	"github.com/porter-dev/porter/api/server/authz"
+	"github.com/porter-dev/porter/api/server/handlers"
+	"github.com/porter-dev/porter/api/server/shared"
+	"github.com/porter-dev/porter/api/server/shared/apierrors"
+	"github.com/porter-dev/porter/api/server/shared/config"
+	"github.com/porter-dev/porter/api/server/shared/requestutils"
+	"github.com/porter-dev/porter/api/types"
+)
+
+var procfileRegex = regexp.MustCompile("^([A-Za-z0-9_]+):\\s*(.+)$")
+
+type GithubGetProcfileHandler struct {
+	handlers.PorterHandlerReadWriter
+	authz.KubernetesAgentGetter
+}
+
+func NewGithubGetProcfileHandler(
+	config *config.Config,
+	decoderValidator shared.RequestDecoderValidator,
+	writer shared.ResultWriter,
+) *GithubGetProcfileHandler {
+	return &GithubGetProcfileHandler{
+		PorterHandlerReadWriter: handlers.NewDefaultPorterHandler(config, decoderValidator, writer),
+	}
+}
+
+func (c *GithubGetProcfileHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	request := &types.GetProcfileRequest{}
+
+	ok := c.DecodeAndValidate(w, r, request)
+
+	if !ok {
+		return
+	}
+
+	owner, name, ok := GetOwnerAndNameParams(c, w, r)
+
+	if !ok {
+		return
+	}
+
+	branch, reqErr := requestutils.GetURLParamString(r, types.URLParamGitBranch)
+
+	if reqErr != nil {
+		c.HandleAPIError(w, r, reqErr)
+		return
+	}
+
+	client, err := GetGithubAppClientFromRequest(c.Config(), r)
+
+	if err != nil {
+		c.HandleAPIError(w, r, apierrors.NewErrInternal(err))
+		return
+	}
+
+	resp, _, _, err := client.Repositories.GetContents(
+		context.TODO(),
+		owner,
+		name,
+		request.Path,
+		&github.RepositoryContentGetOptions{
+			Ref: branch,
+		},
+	)
+
+	if err != nil {
+		http.NotFound(w, r)
+		return
+	}
+
+	fileData, err := resp.GetContent()
+
+	if err != nil {
+		c.HandleAPIError(w, r, apierrors.NewErrInternal(err))
+		return
+	}
+
+	parsedContents := make(types.GetProcfileResponse)
+
+	// parse the procfile information
+	for _, line := range strings.Split(fileData, "\n") {
+		if matches := procfileRegex.FindStringSubmatch(line); matches != nil {
+			parsedContents[matches[1]] = matches[2]
+		}
+	}
+
+	c.WriteResult(w, r, parsedContents)
+}

api/server/router/git_installation.go

@@ -220,5 +220,42 @@ func getGitInstallationRoutes(
 		Router:   r,
 	})
 
+	// GET /api/projects/{project_id}/gitrepos/{installation_id}/repos/{kind}/{owner}/{name}/{branch}/procfile ->
+	// gitinstallation.NewGithubGetProcfileHandler
+	getProcfileEndpoint := factory.NewAPIEndpoint(
+		&types.APIRequestMetadata{
+			Verb:   types.APIVerbGet,
+			Method: types.HTTPVerbGet,
+			Path: &types.Path{
+				Parent: basePath,
+				RelativePath: fmt.Sprintf(
+					"%s/repos/{%s}/{%s}/{%s}/{%s}/procfile",
+					relPath,
+					types.URLParamGitKind,
+					types.URLParamGitRepoOwner,
+					types.URLParamGitRepoName,
+					types.URLParamGitBranch,
+				),
+			},
+			Scopes: []types.PermissionScope{
+				types.UserScope,
+				types.ProjectScope,
+				types.GitInstallationScope,
+			},
+		},
+	)
+
+	getProcfileHandler := gitinstallation.NewGithubGetProcfileHandler(
+		config,
+		factory.GetDecoderValidator(),
+		factory.GetResultWriter(),
+	)
+
+	routes = append(routes, &Route{
+		Endpoint: getProcfileEndpoint,
+		Handler:  getProcfileHandler,
+		Router:   r,
+	})
+
 	return routes, newPath
 }

api/types/git_installation.go

@@ -54,3 +54,9 @@ type GithubDirectoryItem struct {
 }
 
 type GetContentsResponse []GithubDirectoryItem
+
+type GetProcfileRequest struct {
+	Path string `schema:"path" form:"required"`
+}
+
+type GetProcfileResponse map[string]string

docs/developing/backend-refactor-status.md

@@ -55,7 +55,7 @@
 | <li>- [X] `GET /api/projects/{project_id}/gitrepos/{installation_id}/repos/{kind}/{owner}/{name}/branches`                  | AB          |                 |             |                  |
 | <li>- [X] `GET /api/projects/{project_id}/gitrepos/{installation_id}/repos/{kind}/{owner}/{name}/{branch}/buildpack/detect` | AB          |                 |             |                  |
 | <li>- [X] `GET /api/projects/{project_id}/gitrepos/{installation_id}/repos/{kind}/{owner}/{name}/{branch}/contents`         | AB          |                 |             |                  |
-| <li>- [ ] `GET /api/projects/{project_id}/gitrepos/{installation_id}/repos/{kind}/{owner}/{name}/{branch}/procfile`         |             |                 |             |                  |
+| <li>- [X] `GET /api/projects/{project_id}/gitrepos/{installation_id}/repos/{kind}/{owner}/{name}/{branch}/procfile`         | AB          |                 |             |                  |
 | <li>- [ ] `GET /api/projects/{project_id}/gitrepos/{installation_id}/repos/{kind}/{owner}/{name}/{branch}/tarball_url`      |             |                 |             |                  |
 | <li>- [ ] `GET /api/projects/{project_id}/helmrepos`                                                                        |             |                 |             |                  |
 | <li>- [ ] `POST /api/projects/{project_id}/helmrepos`                                                                       |             |                 |             |                  |