OpenAPI: serialize path parameters following Swagger specs

Author: fuma-nama

packages/openapi/src/requests/_shared.ts

@@ -38,6 +38,16 @@ export interface RequestData {
   bodyMediaType?: string;
 }
 
+const FormDelimiter = {
+  spaceDelimited: ' ',
+  pipeDelimited: '|',
+};
+
+const PathPrefix = {
+  label: '.',
+  matrix: ';',
+};
+
 export function ident(code: string, tab: number = 1) {
   return code
     .split('\n')
@@ -106,20 +116,31 @@ export function encodeRequestData(
         return output;
       }
 
-      const sep =
-        {
-          spaceDelimited: ' ',
-          pipeDelimited: '|',
-        }[field.style ?? 'form'] ?? ',';
+      let prefix = '';
+      let sep = ',';
+      if (field.in === 'query') {
+        const style = field.style ?? 'form';
+
+        if (style in FormDelimiter)
+          sep = FormDelimiter[style as keyof typeof FormDelimiter];
+      } else if (field.in === 'path') {
+        const style = field.style ?? 'simple';
+
+        if (style in PathPrefix)
+          prefix = PathPrefix[style as keyof typeof PathPrefix];
+
+        if (explode && prefix.length > 0) sep = prefix;
+      }
+
       output[key] = {
-        value: value.map(String).join(sep),
+        value: prefix + value.map(String).join(sep),
       };
       return output;
     }
 
     if (typeof value === 'object' && value) {
-      // header uses the original key
-      if (explode && field.in === 'header') {
+      // header & path creates key-value pairs
+      if (explode && (field.in === 'header' || field.in === 'path')) {
         output[key] = {
           value: Object.entries(value)
             .map(([k, v]) => `${k}=${v}`)