Get token for PlanetaryComputer resources

!build-snapshot

gears/src/main/java/org/hortonmachine/gears/io/stac/HMStacAsset.java

@@ -112,6 +112,10 @@ public GridCoverage2D readRaster( RegionMap region, String user, String password
             InputStream inputProvider = readS3Raster(cogUri, s3Client);
             reader = new GeoTiffReader(inputProvider);
         } else {
+            if (PlanetaryComputerMicrosoft.isAzureBlob(assetUrl)) {
+                String accessibleHref = PlanetaryComputerMicrosoft.getHrefWithToken(assetUrl);
+                cogUri = new BasicAuthURI(accessibleHref, false);
+            }
             RangeReader rangeReader = new HttpRangeReader(cogUri.getUri(), CogImageReadParam.DEFAULT_HEADER_LENGTH);
             CogSourceSPIProvider inputProvider = new CogSourceSPIProvider(cogUri, new CogImageReaderSpi(),
                     new CogImageInputStreamSpi(), rangeReader.getClass().getName());

gears/src/main/java/org/hortonmachine/gears/io/stac/PlanetaryComputerMicrosoft.java

@@ -0,0 +1,46 @@
+package org.hortonmachine.gears.io.stac;
+
+import org.json.JSONObject;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+
+public class PlanetaryComputerMicrosoft {
+    /**
+     * Planetary Computer assets are usually stored as Azure blobs.
+     * @param href
+     * @return
+     */
+    static boolean isAzureBlob(String href) {
+        return href.contains("blob.core.windows.net");
+    }
+
+    /**
+     * A token is needed to access Planetary Computer assets under Azure blob.
+     * This method gets an Azure blob href and returns a curated href for the same resource.
+     * https://planetarycomputer.microsoft.com/docs/concepts/sas/
+     * @param href
+     * @return href with token
+     * @throws IOException
+     * @throws InterruptedException
+     */
+    static String getHrefWithToken(String href) throws IOException, InterruptedException {
+        String getReadAccess = "https://planetarycomputer.microsoft.com/api/sas/v1/sign?href=" + href;
+        HttpClient client = HttpClient.newBuilder().build();
+        HttpRequest.Builder uriBuilder = HttpRequest.newBuilder()
+                .uri(URI.create(getReadAccess));
+        HttpRequest request = uriBuilder.GET().build();
+        // Send the request and retrieve the response
+        HttpResponse<InputStream> response = client.send(request, HttpResponse.BodyHandlers.ofInputStream());
+        int status = response.statusCode();
+        if (status != 200) {
+            throw new IOException(new String(response.body().readAllBytes()));
+        }
+        JSONObject body = new JSONObject(new String(response.body().readAllBytes()));
+        return body.getString("href");
+    }
+}