Allow uploading a banner image

2024-10-27 07:21:36 +01:00
parent 19b390cbbb
commit 343022273c
11 changed files with 274 additions and 140 deletions
--- a/cmd/frontend/images.go
+++ b/cmd/frontend/images.go
@ -0,0 +1,166 @@
+package frontend
+
+import (
+	"encoding/base64"
+	"encoding/json"
+	"fmt"
+	"html/template"
+	"io"
+	"log"
+	"net/http"
+	"os"
+
+	b "streifling.com/jason/cpolis/cmd/backend"
+)
+
+func serveBase64Image(c *b.Config, filename string) (string, error) {
+	file := c.PicsDir + "/" + filename
+
+	img, err := os.Open(file)
+	if err != nil {
+		return "", fmt.Errorf("error opening file %v: %v", file, err)
+	}
+	defer img.Close()
+
+	imgBytes, err := io.ReadAll(img)
+	if err != nil {
+		return "", fmt.Errorf("error turning %v into bytes: %v", file, err)
+	}
+
+	return base64.StdEncoding.EncodeToString(imgBytes), nil
+}
+
+func UploadImage(c *b.Config, s *b.CookieStore) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		if _, err := getSession(w, r, c, s); err != nil {
+			log.Println(err)
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+
+		if err := r.ParseMultipartForm(10 << 20); err != nil {
+			log.Println(err)
+			http.Error(w, err.Error(), http.StatusBadRequest)
+			return
+		}
+
+		file, _, err := r.FormFile("article-image")
+		if err != nil {
+			log.Println(err)
+			http.Error(w, err.Error(), http.StatusBadRequest)
+			return
+		}
+		defer file.Close()
+
+		filename, err := b.SaveImage(c, file)
+		if err != nil {
+			if err == b.ErrUnsupportedFormat {
+				http.Error(w, "Das Dateiformat wird nicht unterstützt.", http.StatusBadRequest)
+				return
+			}
+			log.Println(err)
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+
+		url := c.Domain + "/image/serve/" + filename
+		w.Header().Set("Content-Type", "application/json")
+		json.NewEncoder(w).Encode(url)
+	}
+}
+
+func UploadIssueImage(c *b.Config, s *b.CookieStore) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		session, err := getSession(w, r, c, s)
+		if err != nil {
+			log.Println(err)
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+
+		if err := r.ParseMultipartForm(10 << 20); err != nil {
+			log.Println(err)
+			http.Error(w, err.Error(), http.StatusBadRequest)
+			return
+		}
+
+		file, _, err := r.FormFile("issue-image")
+		if err != nil {
+			log.Println(err)
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+		defer file.Close()
+
+		filename, err := b.SaveImage(c, file)
+		if err != nil {
+			if err == b.ErrUnsupportedFormat {
+				http.Error(w, "Das Dateiformat wird nicht unterstützt.", http.StatusBadRequest)
+				return
+			}
+			log.Println(err)
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+
+		session.Values["issue-image"] = filename
+		if err = session.Save(r, w); err != nil {
+			log.Println(err)
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+
+		w.WriteHeader(http.StatusOK)
+	}
+}
+
+func UploadBanner(c *b.Config, s *b.CookieStore, fileKey, htmlFile, htmlTemplate string) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		if _, err := getSession(w, r, c, s); err != nil {
+			log.Println(err)
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+
+		file, _, err := r.FormFile(fileKey)
+		if err != nil {
+			log.Println(err)
+			http.Error(w, err.Error(), http.StatusBadRequest)
+			return
+		}
+		defer file.Close()
+
+		filename, err := b.SaveImage(c, file)
+		if err != nil {
+			if err == b.ErrUnsupportedFormat {
+				http.Error(w, "Das Dateiformat wird nicht unterstützt.", http.StatusBadRequest)
+				return
+			}
+			log.Println(err)
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+
+		base64Img, err := serveBase64Image(c, filename)
+		if err != nil {
+			log.Println(err)
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+
+		data := new(struct {
+			BannerImage string
+			URL         string
+		})
+
+		data.BannerImage = base64Img
+		data.URL = c.Domain + "/image/serve/" + filename
+
+		tmpl, err := template.ParseFiles(c.WebDir + "/templates/" + htmlFile)
+		if err = template.Must(tmpl, err).ExecuteTemplate(w, htmlTemplate, data); err != nil {
+			log.Println(err)
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+	}
+}