Expose Context key in profile as property and allow override in bookmark

core/src/main/java/ch/cyberduck/core/Profile.java

@@ -685,6 +685,9 @@ public Map<String, String> getProperties() {
                 property -> StringUtils.contains(property, '=') ? substitutor.replace(StringUtils.substringAfter(property, '=')) : StringUtils.EMPTY)));
         // In profile as dict
         properties.putAll(this.map(PROPERTIES_KEY));
+        if(null != this.getContext()) {
+            properties.put(CONTEXT_KEY, this.getContext());
+        }
         return properties;
     }
 

core/src/main/java/ch/cyberduck/core/serializer/HostDictionary.java

@@ -192,6 +192,12 @@ public Host deserialize(final T serialized) {
             if(customObj != null) {
                 bookmark.setCustom(customObj);
             }
+            final Object contextObj = dict.stringForKey("Context");
+            if(contextObj != null) {
+                bookmark.setProperty("Context", contextObj.toString());
+                // Also set it on credentials so validate() can access it
+                bookmark.getCredentials().setProperty("Context", contextObj.toString());
+            }
             final Object labelObj = dict.stringForKey("Labels");
             if(labelObj != null) {
                 bookmark.setLabels(new HashSet<>(dict.listForKey("Labels")));

s3/src/main/java/ch/cyberduck/core/auth/AWSSessionCredentialsRetriever.java

@@ -75,7 +75,7 @@ public Credentials get() throws BackgroundException {
         final HttpClientBuilder configuration = builder.build(ProxyFactory.get(),
                 new DisabledTranscriptListener(), new DisabledLoginCallback());
         try (CloseableHttpClient client = configuration.build()) {
-            final HttpRequestBase resource = new HttpGet(new HostUrlProvider().withUsername(false).withPath(true).get(address));
+            final HttpRequestBase resource = new HttpGet(url);
             return client.execute(resource, response -> {
                 switch(response.getStatusLine().getStatusCode()) {
                     case HttpStatus.SC_OK:

s3/src/main/java/ch/cyberduck/core/s3/S3Protocol.java

@@ -116,6 +116,10 @@ public String favicon() {
 
     @Override
     public boolean validate(final Credentials credentials, final LoginOptions options) {
+        // Skip credential validation if Context property is present (HTTP credential provider)
+        if(credentials.getProperty("Context") != null) {
+            return true;
+        }
         // Password input is disabled for AWS CLI connection profile but requires lookup in AWS CLI configuration.
         return super.validate(credentials, new LoginOptions(options).token(true));
     }

s3/src/main/java/ch/cyberduck/core/s3/S3Session.java

@@ -27,6 +27,7 @@
 import ch.cyberduck.core.LoginCallback;
 import ch.cyberduck.core.Path;
 import ch.cyberduck.core.PathContainerService;
+import ch.cyberduck.core.Profile;
 import ch.cyberduck.core.Scheme;
 import ch.cyberduck.core.TemporaryAccessTokens;
 import ch.cyberduck.core.UrlProvider;
@@ -264,10 +265,11 @@ protected S3CredentialsStrategy configureCredentialsStrategy(final HttpClientBui
         }
         if(S3Session.isAwsHostname(host.getHostname())) {
             // Try auto-configure
-            if(Scheme.isURL(host.getProtocol().getContext())) {
-                log.debug("Auto-configure credentials from instance metadata {}", host.getProtocol().getContext());
-                // Fetch temporary session token from instance metadata
-                return new AWSSessionCredentialsRetriever(trust, key, host.getProtocol().getContext());
+            final String context = preferences.getProperty(Profile.CONTEXT_KEY);
+            if(Scheme.isURL(context)) {
+                log.debug("Auto-configure credentials from HTTP endpoint {}", context);
+                // Fetch temporary session token from HTTP endpoint
+                return new AWSSessionCredentialsRetriever(trust, key, context);
             }
         }
         if(host.getProtocol().isRoleConfigurable()) {