Added "qdnContext" variable, with possible values of "render", "gateway", or "domainMap".

This is used internally to allow Q-Apps to determine how to handle certain requests.

src/main/java/org/qortal/api/HTMLParser.java

@@ -12,11 +12,13 @@ public class HTMLParser {
 
     private String linkPrefix;
     private byte[] data;
+    private String qdnContext;
 
-    public HTMLParser(String resourceId, String inPath, String prefix, boolean usePrefix, byte[] data) {
+    public HTMLParser(String resourceId, String inPath, String prefix, boolean usePrefix, byte[] data, String qdnContext) {
         String inPathWithoutFilename = inPath.substring(0, inPath.lastIndexOf('/'));
         this.linkPrefix = usePrefix ? String.format("%s/%s%s", prefix, resourceId, inPathWithoutFilename) : "";
         this.data = data;
+        this.qdnContext = qdnContext;
     }
 
     public void addAdditionalHeaderTags() {
@@ -29,6 +31,10 @@ public class HTMLParser {
             String qAppsScriptElement = String.format("<script src=\"/apps/q-apps.js?time=%d\">", System.currentTimeMillis());
             head.get(0).prepend(qAppsScriptElement);
 
+            // Add QDN context var
+            String qdnContextVar = String.format("<script>var qdnContext=\"%s\";</script>", this.qdnContext);
+            head.get(0).prepend(qdnContextVar);
+
             // Add base href tag
             String baseElement = String.format("<base href=\"%s\">", baseUrl);
             head.get(0).prepend(baseElement);

src/main/java/org/qortal/api/domainmap/resource/DomainMapResource.java

@@ -51,7 +51,7 @@ public class DomainMapResource {
                                     String secret58, String prefix, boolean usePrefix, boolean async) {
 
         ArbitraryDataRenderer renderer = new ArbitraryDataRenderer(resourceId, resourceIdType, service, inPath,
-                secret58, prefix, usePrefix, async, request, response, context);
+                secret58, prefix, usePrefix, async, "domainMap", request, response, context);
         return renderer.render();
     }
 

src/main/java/org/qortal/api/gateway/resource/GatewayResource.java

@@ -119,7 +119,7 @@ public class GatewayResource {
                                     String secret58, String prefix, boolean usePrefix, boolean async) {
 
         ArbitraryDataRenderer renderer = new ArbitraryDataRenderer(resourceId, resourceIdType, service, inPath,
-                secret58, prefix, usePrefix, async, request, response, context);
+                secret58, prefix, usePrefix, async, "gateway", request, response, context);
         return renderer.render();
     }
 

src/main/java/org/qortal/api/resource/RenderResource.java

@@ -216,7 +216,7 @@ public class RenderResource {
                                     String secret58, String prefix, boolean usePrefix, boolean async, String theme) {
 
         ArbitraryDataRenderer renderer = new ArbitraryDataRenderer(resourceId, resourceIdType, service, inPath,
-                secret58, prefix, usePrefix, async, request, response, context);
+                secret58, prefix, usePrefix, async, "render", request, response, context);
 
         if (theme != null) {
             renderer.setTheme(theme);

src/main/java/org/qortal/arbitrary/ArbitraryDataRenderer.java

@@ -40,12 +40,13 @@ public class ArbitraryDataRenderer {
     private final String prefix;
     private final boolean usePrefix;
     private final boolean async;
+    private final String qdnContext;
     private final HttpServletRequest request;
     private final HttpServletResponse response;
     private final ServletContext context;
 
     public ArbitraryDataRenderer(String resourceId, ResourceIdType resourceIdType, Service service, String inPath,
-                                 String secret58, String prefix, boolean usePrefix, boolean async,
+                                 String secret58, String prefix, boolean usePrefix, boolean async, String qdnContext,
                                  HttpServletRequest request, HttpServletResponse response, ServletContext context) {
 
         this.resourceId = resourceId;
@@ -56,6 +57,7 @@ public class ArbitraryDataRenderer {
         this.prefix = prefix;
         this.usePrefix = usePrefix;
         this.async = async;
+        this.qdnContext = qdnContext;
         this.request = request;
         this.response = response;
         this.context = context;
@@ -118,7 +120,7 @@ public class ArbitraryDataRenderer {
             if (HTMLParser.isHtmlFile(filename)) {
                 // HTML file - needs to be parsed
                 byte[] data = Files.readAllBytes(Paths.get(filePath)); // TODO: limit file size that can be read into memory
-                HTMLParser htmlParser = new HTMLParser(resourceId, inPath, prefix, usePrefix, data);
+                HTMLParser htmlParser = new HTMLParser(resourceId, inPath, prefix, usePrefix, data, qdnContext);
                 htmlParser.addAdditionalHeaderTags();
                 response.addHeader("Content-Security-Policy", "default-src 'self' 'unsafe-inline' 'unsafe-eval'; media-src 'self' blob:; img-src 'self' data: blob:;");
                 response.setContentType(context.getMimeType(filename));