Begin implementation of formatted barcodes

web/generate.route.go

@@ -0,0 +1,68 @@
+package web
+
+import (
+	"encoding/json"
+	"fmt"
+	"image"
+	"image/png"
+	"net/http"
+
+	"git.fjla.uk/fred.boniface/barcodes/generation"
+	"git.fjla.uk/fred.boniface/barcodes/validation"
+	"github.com/boombuler/barcode"
+)
+
+// Generates a barcode from the data and options provided in the request body
+func generateBarcode(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		http.Error(w, "Use a POST request for barcode generation", http.StatusMethodNotAllowed)
+		return
+	}
+
+	var req BarcodeRequest
+	err := json.NewDecoder(r.Body).Decode(&req)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	parameters := generation.Parameters{
+		Format:   generation.BarcodeType(req.BarcodeType),
+		ECCLevel: generation.ECCLevel(req.ECCLevel),
+		Content:  req.Content,
+	}
+
+	validate := validation.Validate(parameters)
+	if !validate {
+		fmt.Println("Validation Failed")
+		http.Error(w, "Validation Failed", http.StatusBadRequest)
+		return
+	}
+
+	barcodeGen, err := generation.Generate(parameters)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	if barcodeGen == nil {
+		fmt.Println("Generation failed, no barcode created")
+		http.Error(w, "Barcode Generation Failed", http.StatusInternalServerError)
+		return
+	}
+
+	barcodeGen, _ = barcode.Scale(barcodeGen, int(req.Width), int(req.Height))
+
+	image, isImage := barcodeGen.(image.Image)
+	if !isImage {
+		fmt.Println("Generation failed - no image")
+		http.Error(w, "Generated Barcode is not an image", http.StatusInternalServerError)
+		return
+	}
+
+	w.Header().Set("Content-Type", "image/png")
+
+	err = png.Encode(w, image)
+	if err != nil {
+		http.Error(w, "Error streaming barcode", http.StatusInternalServerError)
+	}
+}