Remove dependency on Apache Commons

Add our own Base64 class for handling base64 encoding. This way we don't
need to depend on all of Apache Commons.

Author: Greg Curtis

build.gradle

@@ -16,7 +16,6 @@ repositories {
 
 dependencies {
     compile 'com.eclipsesource.minimal-json:minimal-json:0.9.1'
-    compile 'commons-codec:commons-codec:1.10'
     testCompile 'junit:junit:4.11'
     testCompile 'org.hamcrest:hamcrest-library:1.3'
     testCompile 'com.github.tomakehurst:wiremock:1.52'

src/main/java/com/box/sdk/Base64.java

@@ -0,0 +1,104 @@
+package com.box.sdk;
+
+import java.io.ByteArrayOutputStream;
+
+/**
+ * Contains a method for performing base64 encoding.
+ *
+ * <p>This class is included so that we don't need to add a dependency on Apache Commons for base64 encoding.</p>
+ *
+ * <p>The code in this class was mostly taken from https://gist.github.com/EmilHernvall/953733#file-base64-java</p>
+ */
+final class Base64 {
+
+    private Base64() { }
+
+    static String encode(byte[] data) {
+        char[] tbl = {
+            'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
+            'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
+            'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
+            'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/' };
+
+        StringBuilder buffer = new StringBuilder();
+        int pad = 0;
+        for (int i = 0; i < data.length; i += 3) {
+
+            int b = ((data[i] & 0xFF) << 16) & 0xFFFFFF;
+            if (i + 1 < data.length) {
+                b |= (data[i + 1] & 0xFF) << 8;
+            } else {
+                pad++;
+            }
+            if (i + 2 < data.length) {
+                b |= (data[i + 2] & 0xFF);
+            } else {
+                pad++;
+            }
+
+            for (int j = 0; j < 4 - pad; j++) {
+                int c = (b & 0xFC0000) >> 18;
+                buffer.append(tbl[c]);
+                b <<= 6;
+            }
+        }
+        for (int j = 0; j < pad; j++) {
+            buffer.append("=");
+        }
+
+        return buffer.toString();
+    }
+
+    public static byte[] decode(String data) {
+        int[] tbl = {
+            -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+            -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+            -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54,
+            55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2,
+            3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
+            20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30,
+            31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
+            48, 49, 50, 51, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+            -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+            -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+            -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+            -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+            -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+            -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+            -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 };
+        byte[] bytes = data.getBytes();
+        ByteArrayOutputStream buffer = new ByteArrayOutputStream();
+        for (int i = 0; i < bytes.length;) {
+            int b = 0;
+            if (tbl[bytes[i]] != -1) {
+                b = (tbl[bytes[i]] & 0xFF) << 18;
+            } else {
+                i++;
+                continue;
+            }
+
+            int num = 0;
+            if (i + 1 < bytes.length && tbl[bytes[i + 1]] != -1) {
+                b = b | ((tbl[bytes[i + 1]] & 0xFF) << 12);
+                num++;
+            }
+            if (i + 2 < bytes.length && tbl[bytes[i + 2]] != -1) {
+                b = b | ((tbl[bytes[i + 2]] & 0xFF) << 6);
+                num++;
+            }
+            if (i + 3 < bytes.length && tbl[bytes[i + 3]] != -1) {
+                b = b | (tbl[bytes[i + 3]] & 0xFF);
+                num++;
+            }
+
+            while (num > 0) {
+                int c = (b & 0xFF0000) >> 16;
+                buffer.write((char) c);
+                b <<= 8;
+                num--;
+            }
+            i += 4;
+        }
+        return buffer.toByteArray();
+    }
+}

src/main/java/com/box/sdk/BoxAPIRequest.java

@@ -14,9 +14,6 @@
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
-import org.apache.commons.codec.binary.Base64;
-
-
 /**
  * Used to make HTTP requests to the Box API.
  *
@@ -355,8 +352,8 @@ private BoxAPIResponse trySend(ProgressListener listener) {
             if (this.api.getProxy() != null) {
                 if (this.api.getProxyUsername() != null && this.api.getProxyPassword() != null) {
                     String usernameAndPassword = this.api.getProxyUsername() + ":" + this.api.getProxyPassword();
-                    String encoded = new String(Base64.encodeBase64(usernameAndPassword.getBytes()));
-                    connection.addRequestProperty("Proxy-authorization", "Basic " + encoded);
+                    String encoded = new String(Base64.encode(usernameAndPassword.getBytes()));
+                    connection.addRequestProperty("Proxy-Authorization", "Basic " + encoded);
                 }
             }