Feat: Edit PR Description (#22)

This MR makes it possible to edit the description. Non-breaking, will happen within the normal description popup.

cmd/update.go

@@ -0,0 +1,74 @@
+package main
+
+import (
+	"encoding/json"
+	"errors"
+	"io"
+	"log"
+	"net/http"
+
+	"github.com/xanzy/go-gitlab"
+)
+
+type UpdateRequest struct {
+	Description string `json:"description"`
+}
+
+type UpdateResponse struct {
+	SuccessResponse
+	MergeRequest *gitlab.MergeRequest `json:"mr"`
+}
+
+func UpdateHandler(w http.ResponseWriter, r *http.Request) {
+	c := r.Context().Value("client").(Client)
+	w.Header().Set("Content-Type", "application/json")
+	if r.Method != http.MethodPut {
+		c.handleError(w, errors.New("Invalid request type"), "That request type is not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	body, err := io.ReadAll(r.Body)
+	if err != nil {
+		c.handleError(w, err, "Could not read request body", http.StatusBadRequest)
+		return
+	}
+
+	defer r.Body.Close()
+	var updateRequest UpdateRequest
+	err = json.Unmarshal(body, &updateRequest)
+
+	if err != nil {
+		c.handleError(w, err, "Could not read JSON from request", http.StatusBadRequest)
+		return
+	}
+
+	git, err := gitlab.NewClient(c.authToken)
+	if err != nil {
+		log.Fatalf("Failed to create client: %v", err)
+	}
+
+	mr, res, err := git.MergeRequests.UpdateMergeRequest(c.projectId, c.mergeId, &gitlab.UpdateMergeRequestOptions{Description: &updateRequest.Description})
+
+	if err != nil {
+		c.handleError(w, err, "Could not edit merge request", http.StatusBadRequest)
+		return
+	}
+
+	if res.StatusCode != http.StatusOK {
+		c.handleError(w, err, "Could not edit merge request", http.StatusBadRequest)
+		return
+	}
+
+	w.WriteHeader(http.StatusOK)
+
+	response := UpdateResponse{
+		SuccessResponse: SuccessResponse{
+			Message: "Merge request updated",
+			Status:  http.StatusOK,
+		},
+		MergeRequest: mr,
+	}
+
+	json.NewEncoder(w).Encode(response)
+
+}