Sample client program/script to access read only data from Autonomous database Pre Authenticated request URL

java/autonomous-db-parurl/README.md

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+# Java Sample Accessing Read Only data from Autonomous Database Pre Authenticated Request URL.
+
+This example java program allows consumers to access data from Autonomous Database Pre-Authenticated Request URL.
+
+More details about the Autonomous Database Pre Authenticated Request URL can be found [here](https://docs.oracle.com/en/cloud/paas/autonomous-database/serverless/adbsb/autonomous-preauthenticated-request-url.html#GUID-976ABD3A-38A0-4E5E-BCA4-9FFB9A748C43). 

java/autonomous-db-parurl/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+ xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+ <modelVersion>4.0.0</modelVersion>
+ <groupId>autonomous-db-parurl</groupId>
+ <artifactId>autonomous-db-parurl</artifactId>
+ <version>0.0.1-SNAPSHOT</version>
+ <name>autonomous-db-parurl</name>
+
+ <properties>
+ <maven.compiler.source>11</maven.compiler.source>
+ <maven.compiler.target>${maven.compiler.source}</maven.compiler.target>
+ </properties>
+
+ <build>
+ <plugins>
+ <plugin>
+ <groupId>org.apache.maven.plugins</groupId>
+ <artifactId>maven-compiler-plugin</artifactId>
+ </plugin>
+ </plugins>
+ </build>
+
+ <dependencies>
+ <dependency>
+ <groupId>org.projectlombok</groupId>
+ <artifactId>lombok</artifactId>
+ <version>RELEASE</version>
+ </dependency>
+ <dependency>
+ <groupId>org.apache.commons</groupId>
+ <artifactId>commons-lang3</artifactId>
+ <version>3.12.0</version>
+ </dependency>
+ <dependency>
+ <groupId>com.fasterxml.jackson.core</groupId>
+ <artifactId>jackson-databind</artifactId>
+ <version>2.17.1</version>
+ </dependency>
+ <dependency>
+ <groupId>org.apache.httpcomponents</groupId>
+ <artifactId>httpclient</artifactId>
+ <version>4.5.4</version>
+ </dependency>
+ </dependencies>
+</project>

java/autonomous-db-parurl/src/main/java/AdbsParUrlClient.java

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+/**
+ * Copyright (c) 2024 Oracle and/or its affiliates.
+ *
+ * The Universal Permissive License (UPL), Version 1.0
+ *
+ * Subject to the condition set forth below, permission is hereby granted to any
+ * person obtaining a copy of this software, associated documentation and/or data
+ * (collectively the "Software"), free of charge and under any and all copyright
+ * rights in the Software, and any and all patent rights owned or freely
+ * licensable by each licensor hereunder covering either (i) the unmodified
+ * Software as contributed to or provided by such licensor, or (ii) the Larger
+ * Works (as defined below), to deal in both
+ *
+ * (a) the Software, and
+ * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
+ * one is included with the Software (each a "Larger Work" to which the Software
+ * is contributed by such licensors),
+ *
+ * without restriction, including without limitation the rights to copy, create
+ * derivative works of, display, perform, and distribute the Software and make,
+ * use, sell, offer for sale, import, export, have made, and have sold the
+ * Software and the Larger Work(s), and to sublicense the foregoing rights on
+ * either these or other terms.
+ *
+ * This license is subject to the following condition:
+ * The above copyright notice and either this complete permission notice or at
+ * a minimum a reference to the UPL must be included in all copies or
+ * substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+import org.apache.commons.lang3.BooleanUtils;
+import org.apache.http.HttpResponse;
+import org.apache.http.client.methods.HttpGet;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.impl.client.HttpClients;
+import org.apache.http.util.EntityUtils;
+
+import java.io.IOException;
+import java.net.HttpURLConnection;
+import java.util.List;
+
+/**
+ * This class provides a basic example of how to read the data from Autonomous Database pre-authenticated URL.
+ *
+ * <p>The example has some constraints. This is a single threaded example & cannot be used to fetch
+ * the data from same AdbsParUrlClient instance in multiple threads.
+ *
+ * <p>This example will do the following things:
+ *
+ * <ul>
+ * <li>Accepts Autonomous Database pre-authenticated URL as input.
+ * <li>Returns an iterator used to iterate records one by one.
+ * </ul>
+ */
+public class AdbsParUrlClient {
+ /**
+ * Pre Authenticated Request URL.
+ */
+ private final String adbsParUrl;
+
+ /**
+ * Constructor
+ *
+ * @param adbsParUrl Pre Authenticated Request URL.
+ */
+ public AdbsParUrlClient(String adbsParUrl) {
+ this.adbsParUrl = adbsParUrl;
+ }
+
+ /**
+ * Creates ResultSet object for iterating the results.
+ *
+ * @return ResultSet object for iterating the results.
+ * @throws IOException if fetching data from par url fails.
+ */
+ public ResultSet execute() throws IOException {
+ final ResultSet resultSet = new ResultSet(this.adbsParUrl);
+ return resultSet;
+ }
+
+ /**
+ * Par Url Response pojo class
+ */
+ @Getter
+ @Setter
+ @NoArgsConstructor
+ public static class ParUrlResponse {
+ private List<JsonNode> items;
+ private Boolean hasMore;
+ private long limit;
+ private long offset;
+ private long count;
+ private List<Link> links;
+
+ @Getter
+ @Setter
+ public static class Link {
+ private String rel;
+ private String href;
+ }
+ }
+
+ /**
+ * Helper class to iterate data fetched from the par url.
+ */
+ public static class ResultSet {
+ private static final ObjectMapper mapper = new ObjectMapper();
+ private int currentOffset;
+ private ParUrlResponse parUrlResponse;
+
+ /**
+ * Constructor
+ *
+ * @param adbsParUrl Pre Authenticated Request URL.
+ * @throws IOException if fetching data from par url fails.
+ */
+ public ResultSet(String adbsParUrl) throws IOException {
+ this.parUrlResponse = fetchData(adbsParUrl);
+ this.currentOffset = 0;
+ }
+
+ /**
+ * Method to fetch data from the par url.
+ *
+ * @param adbsParUrl Pre Authenticated Request URL.
+ * @return result pojo for the fetch par url data operation.
+ * @throws IOException
+ */
+ private ParUrlResponse fetchData(String adbsParUrl) throws IOException {
+ final CloseableHttpClient httpClient = HttpClients.createDefault();
+ final HttpGet request = new HttpGet(adbsParUrl);
+ final HttpResponse response = httpClient.execute(request);
+ final int statusCode = response.getStatusLine().getStatusCode();
+
+ if (statusCode == HttpURLConnection.HTTP_OK) { // success
+ String responseStr = EntityUtils.toString(response.getEntity());
+ return mapper.readValue(responseStr, ParUrlResponse.class);
+ } else {
+ //System.out.println(response.getStatusLine().toString());
+ throw new RuntimeException("Error while fetching data for the par Url.");
+ }
+
+ }
+
+ /**
+ * Helper method to check if more items are still available.
+ *
+ * @return true if available else false
+ */
+ public boolean hasNext() {
+ return currentOffset < parUrlResponse.getCount() || (currentOffset == parUrlResponse.getCount() &&
+ BooleanUtils.isTrue(parUrlResponse.hasMore));
+ }
+
+ /**
+ * Helper method to return the next item from the cached list.
+ *
+ * @return next item from the cached data list.
+ * @throws IOException if fetching data from par url fails.
+ */
+ public JsonNode next() throws IOException {
+ if (currentOffset < parUrlResponse.getCount()) {
+ return parUrlResponse.getItems().get(currentOffset++);
+ }
+
+ this.currentOffset = 0;
+ this.parUrlResponse = fetchData(getNextLink());
+ return parUrlResponse.getItems().get(currentOffset++);
+ }
+
+ /**
+ * Method to get the fetch link for the next page items.
+ *
+ * @return next page link.
+ */
+ private String getNextLink() {
+ return parUrlResponse.links.stream()
+ .filter(l -> "next".equalsIgnoreCase(l.rel))
+ .map(l -> l.href)
+ .findFirst().get();
+ }
+ }
+
+ /**
+ * Fetch Data from par url sample main method.
+ *
+ * @param args input arguments
+ * @throws IOException if fetching data from par url fails.
+ */
+ public static void main(String[] args) throws IOException {
+
+ /**
+ * Setting sample Adbs par url
+ */
+ final String sampleAdbsParUrl = "https://dataaccess.adb.us-phoenix-1.oraclecloudapps.com/adb/p/NYGM5PicEMTe1hF.../data";
+
+ /**
+ * Initialize the class instance fetching par url data
+ */
+ AdbsParUrlClient parUrlClient = new AdbsParUrlClient(sampleAdbsParUrl);
+ ResultSet rs = parUrlClient.execute();
+
+ /**
+ * Iterate the list until all records are returned.
+ */
+ while (rs.hasNext()) {
+ JsonNode node = rs.next();
+ System.out.println(node);
+ }
+ }
+}
+

javascript/autonomous-db-parurl/AdbsParUrlClient.js

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+/*
+## Copyright (c) 2024 Oracle and/or its affiliates.
+##
+## The Universal Permissive License (UPL), Version 1.0
+##
+## Subject to the condition set forth below, permission is hereby granted to any
+## person obtaining a copy of this software, associated documentation and/or data
+## (collectively the "Software"), free of charge and under any and all copyright
+## rights in the Software, and any and all patent rights owned or freely
+## licensable by each licensor hereunder covering either (i) the unmodified
+## Software as contributed to or provided by such licensor, or (ii) the Larger
+## Works (as defined below), to deal in both
+##
+## (a) the Software, and
+## (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
+## one is included with the Software (each a "Larger Work" to which the Software
+## is contributed by such licensors),
+##
+## without restriction, including without limitation the rights to copy, create
+## derivative works of, display, perform, and distribute the Software and make,
+## use, sell, offer for sale, import, export, have made, and have sold the
+## Software and the Larger Work(s), and to sublicense the foregoing rights on
+## either these or other terms.
+##
+## This license is subject to the following condition:
+## The above copyright notice and either this complete permission notice or at
+## a minimum a reference to the UPL must be included in all copies or
+## substantial portions of the Software.
+##
+## THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+## IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+## FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+## AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+## LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+## OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+## SOFTWARE.
+*/
+
+/**
+ * This javascript class provides a basic interface example to read the data from Autonomous Database pre-authenticated URL.
+ */
+class AdbsParUrlClient {
+ constructor(parUrl) {
+ this.items = [];
+ this.totalRecords = 0;
+ this.collectionIndexPosition = 0;
+ this.nextGetParUrl = parUrl;
+ this.itemsSize = 0;
+ }
+
+ /**
+ * Return the next record from the cache for the Pre-auth request url.
+ */
+ getNextItem() {
+ if (this.collectionIndexPosition < this.itemsSize) {
+ return this.items[this.collectionIndexPosition++];
+ } else if (this.nextGetParUrl == null) {
+ this.items = [];
+ this.collectionIndexPosition = 0;
+ this.nextGetParUrl = null;
+ this.itemsSize = 0;
+ return null;
+ } else {
+ this.items = [];
+ this.collectionIndexPosition = 0;
+ this.itemsSize = 0;
+ var jsonResponse = this.fetchParUrlData();
+ var hasMore = jsonResponse.hasMore;
+
+ console.log("items returned: " + jsonResponse.items.length);
+ this.totalRecords = this.totalRecords + jsonResponse.items.length;
+ this.itemsSize = jsonResponse.items.length;
+
+ for (var count = 0; count < jsonResponse.items.length; count++) {
+ this.items.push(jsonResponse.items[count]);
+ }
+
+ console.log("hasMore: " + hasMore);
+ if (hasMore) {
+ var links = jsonResponse.links;
+ for (var count = 0; count < links.length; count++) {
+ if (links[count]['rel'] == 'next') {
+ this.nextGetParUrl = links[count]['href'];
+ console.log("Next url href: " + this.nextGetParUrl);
+ }
+ }
+ } else {
+ this.nextGetParUrl = null;
+ }
+
+ return this.items[this.collectionIndexPosition++];
+ }
+ }
+
+ /**
+ * Fetch the Par Url data by invoking HTTP Get call.
+ */
+ fetchParUrlData() {
+ console.log("Invoking Get call on Url: " + this.nextGetParUrl);
+ var request = new XMLHttpRequest();
+ request.open("GET", this.nextGetParUrl, false);
+ request.setRequestHeader("Content-Type", "application/json");
+ request.send();
+
+ console.log("Get Call status: " + request.status);
+
+ if (request.status === 200) {
+ return JSON.parse(request.responseText);
+ } else {
+ throw new Error("Failed to fetch the par url data");
+ }
+ }
+}