Add support for retrieving exception formats from WMS capabilities

src/shared/models.ts

@@ -17,6 +17,16 @@ export type GenericEndpointInfo = {
    * or the list of 'Formats' from a WMS GetCapabilities
    */
   outputFormats?: MimeType[];
+  /**
+   * Contains a list of formats that can be used for WMS GetFeatureInfo,
+   * or undefined for other services such as WFS
+   */
+  infoFormats?: MimeType[];
+  /**
+   * Contains a list of formats that can be used for Exceptions for WMS GetMap,
+   * or undefined for other services such as WFS
+   */
+  exceptionFormats?: MimeType[] | string[];
 };
 
 export type MimeType = string;

src/wms/capabilities.spec.ts

@@ -297,6 +297,10 @@ describe('WMS capabilities', () => {
         'application/x-pdf',
         'image/svg+xml',
       ],
+      infoFormats: ['text/plain', 'application/vnd.ogc.gml'],
+      exceptionFormats: [
+        /* these differ depending on the WMS version used */
+      ],
       keywords: [
         'Géologie',
         'BRGM',
@@ -310,11 +314,17 @@ describe('WMS capabilities', () => {
 
     it('reads the service info (1.3.0)', () => {
       const doc = parseXmlString(capabilities130);
+      expectedInfo.exceptionFormats = ['XML', 'INIMAGE', 'BLANK'];
       expect(readInfoFromCapabilities(doc)).toEqual(expectedInfo);
     });
 
     it('reads the service info (1.1.1)', () => {
       const doc = parseXmlString(capabilities111);
+      expectedInfo.exceptionFormats = [
+        'application/vnd.ogc.se_xml',
+        'application/vnd.ogc.se_inimage',
+        'application/vnd.ogc.se_blank',
+      ];
       expect(readInfoFromCapabilities(doc)).toEqual(expectedInfo);
     });
   });

src/wms/capabilities.ts

@@ -57,6 +57,40 @@ export function readOutputFormatsFromCapabilities(
   return outputFormats;
 }
 
+export function readInfoFormatsFromCapabilities(capabilitiesDoc: XmlDocument) {
+  const capability = findChildElement(
+    getRootElement(capabilitiesDoc),
+    'Capability'
+  );
+  const getFeatureInfo = findChildElement(
+    findChildElement(capability, 'Request'),
+    'GetFeatureInfo'
+  );
+  const outputFormats = findChildrenElement(getFeatureInfo, 'Format').map(
+    getElementText
+  );
+  return outputFormats;
+}
+
+/**
+ * Will return all available exception formats
+ * @param capabilitiesDoc Capabiliites document
+ * @return Available exception formats
+ */
+export function readExceptionFormatsFromCapabilities(
+  capabilitiesDoc: XmlDocument
+) {
+  const capability = findChildElement(
+    getRootElement(capabilitiesDoc),
+    'Capability'
+  );
+  const exception = findChildElement(capability, 'Exception');
+  const exceptionFormats = findChildrenElement(exception, 'Format').map(
+    getElementText
+  );
+  return exceptionFormats;
+}
+
 /**
  * Will read service-related info from the capabilities doc
  * @param capabilitiesDoc Capabilities document
@@ -66,7 +100,10 @@ export function readInfoFromCapabilities(
   capabilitiesDoc: XmlDocument
 ): GenericEndpointInfo {
   const service = findChildElement(getRootElement(capabilitiesDoc), 'Service');
-  const formats = readOutputFormatsFromCapabilities(capabilitiesDoc);
+  const outputFormats = readOutputFormatsFromCapabilities(capabilitiesDoc);
+  const infoFormats = readInfoFormatsFromCapabilities(capabilitiesDoc);
+  const exceptionFormats =
+    readExceptionFormatsFromCapabilities(capabilitiesDoc);
   const keywords = findChildrenElement(
     findChildElement(service, 'KeywordList'),
     'Keyword'
@@ -78,7 +115,9 @@ export function readInfoFromCapabilities(
     title: getElementText(findChildElement(service, 'Title')),
     name: getElementText(findChildElement(service, 'Name')),
     abstract: getElementText(findChildElement(service, 'Abstract')),
-    outputFormats: formats,
+    outputFormats: outputFormats,
+    infoFormats: infoFormats,
+    exceptionFormats: exceptionFormats,
     fees: getElementText(findChildElement(service, 'Fees')),
     constraints: getElementText(findChildElement(service, 'AccessConstraints')),
     keywords,

src/wms/endpoint.spec.ts

@@ -187,6 +187,8 @@ describe('WmsEndpoint', () => {
           'application/x-pdf',
           'image/svg+xml',
         ],
+        infoFormats: ['text/plain', 'application/vnd.ogc.gml'],
+        exceptionFormats: ['XML', 'INIMAGE', 'BLANK'],
         keywords: [
           'Géologie',
           'BRGM',