reworking errors + now using a working dir for our converter

app/handlers/context/context.go

@@ -14,6 +14,7 @@ type key uint32
 const (
 	contentTypeKey key = iota
 	converterKey
+	resultFilePathKey
 )
 
 func WithContentType(r *http.Request, contentType ghttp.ContentType) *http.Request {
@@ -24,6 +25,12 @@ func WithContentType(r *http.Request, contentType ghttp.ContentType) *http.Reque
 	return r
 }
 
+type contentTypeNotFoundError struct{}
+
+func (e *contentTypeNotFoundError) Error() string {
+	return "The 'Content-Type' was not found in request context"
+}
+
 func GetContentType(r *http.Request) (ghttp.ContentType, error) {
 	ct, ok := r.Context().Value(contentTypeKey).(ghttp.ContentType)
 	if !ok {
@@ -41,6 +48,12 @@ func WithConverter(r *http.Request, converter *converter.Converter) *http.Reques
 	return r
 }
 
+type converterNotFoundError struct{}
+
+func (e *converterNotFoundError) Error() string {
+	return "The converter was not found in request context"
+}
+
 func GetConverter(r *http.Request) (*converter.Converter, error) {
 	c, ok := r.Context().Value(converterKey).(*converter.Converter)
 	if !ok {
@@ -49,3 +62,26 @@ func GetConverter(r *http.Request) (*converter.Converter, error) {
 
 	return c, nil
 }
+
+func WithResultFilePath(r *http.Request, resultFilePath string) *http.Request {
+	ctx := r.Context()
+	ctx = context.WithValue(ctx, resultFilePathKey, resultFilePath)
+	r = r.WithContext(ctx)
+
+	return r
+}
+
+type resultFilePathNotFoundError struct{}
+
+func (e *resultFilePathNotFoundError) Error() string {
+	return "The resultFilePath was not found in request context"
+}
+
+func GetResultFilePath(r *http.Request) (string, error) {
+	path, ok := r.Context().Value(resultFilePathKey).(string)
+	if !ok {
+		return "", &resultFilePathNotFoundError{}
+	}
+
+	return path, nil
+}