1 files changed, 84 insertions, 0 deletions
diff --git a/utils/errors.go b/utils/errors.go
new file mode 100644
index 0000000..757d2a1
--- /dev/null
+++ b/utils/errors.go
@@ -0,0 +1,84 @@
+
+package utils
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+)
+
+func Err(w http.ResponseWriter, code int, a ...interface{}) {
+
+	var msg string  // format string for error message
+	var hc int      // HTTP error code
+
+	var prefix string = fmt.Sprintf("Error %d - ", code)
+
+	// ATTENTION: the used error codes in this switch statements should be
+	// stable. Do not change them, just append to the list!
+	switch code {
+
+		case 1:
+			msg = "Failed to load recipes from database."
+			hc = http.StatusInternalServerError
+
+		case 2:
+			msg = "Could not parse recipe from database request."
+			hc = http.StatusInternalServerError
+
+		case 3:
+			msg = "Exactly 1 'id' URL parameter expected but %d provided."
+			hc = http.StatusBadRequest
+
+		case 4:
+			msg = "'id' URL parameter '%s' doas not match the regex '%s'."
+			hc = http.StatusBadRequest
+
+		case 5:
+			msg = "Received error from database: '%s'."
+			hc = http.StatusInternalServerError
+
+		case 6:
+			msg = "Expected exactly 1 recipe from database but got %d."
+			hc = http.StatusInternalServerError
+
+		// deprecated
+		case 7:
+			msg = "Exactly 1 'type' URL parameter expected but %d provided."
+			hc = http.StatusBadRequest
+
+		case 8:
+			msg = "Form data does not contain recipe URL (key is '%s')."
+			hc = http.StatusBadRequest
+
+		case 9:
+			msg = "Could not add recipe: '%s'."
+			hc = http.StatusInternalServerError
+
+		case 10:
+			msg = "Expected exactly 1 recipe URL in '%s' but got %d (regex is '%s')."
+			hc = http.StatusBadRequest
+
+		case 11:
+			msg = "Could not get recipe ID from database: '%s'."
+			hc = http.StatusInternalServerError
+
+		// deprecated
+		case 12:
+			msg = "Given recipe type '%s' is unknown."
+			hc = http.StatusBadRequest
+
+		default:
+			msg = "An unknown error occured."
+			hc = http.StatusInternalServerError
+
+	}
+
+	// format full error message
+	final := fmt.Sprintf(prefix + msg, a...)
+
+	// send message to log and user
+	log.Println(final)
+	http.Error(w, final, hc)
+
+}