get Authentication Token - Java java.net

Java examples for java.net:Authenticator

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Description

get Authentication Token

Demo Code


//package com.java2s;
import java.math.BigInteger;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;

public class Main {
    public static void main(String[] argv) throws Exception {
        String publicKey = "java2s.com";
        String privateKey = "java2s.com";
        System.out.println(getAuthToken(publicKey, privateKey));
    }//from www.  j  av a 2s.  co m

    private static final String base64code = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
            + "abcdefghijklmnopqrstuvwxyz" + "0123456789" + "+/";
    private static final int splitLinesAt = 76;

    public static String getAuthToken(String publicKey, String privateKey) {
        String hash = getHMAC_SHA1(publicKey, privateKey);
        String headerValue = publicKey + ":" + hash;
        return encode(new String(headerValue.getBytes())).replace("\r\n",
                "");
    }

    private static String getHMAC_SHA1(String value, String key) {
        if (value == null || key == null || value.trim() == ""
                || key.trim() == "") {
            throw new RuntimeException(
                    "Please enter your Mashape keys in the configuration file.");
        }
        try {
            // Get an hmac_sha1 key from the raw key bytes
            byte[] keyBytes = key.getBytes();
            SecretKeySpec signingKey = new SecretKeySpec(keyBytes,
                    "HmacSHA1");

            // Get an hmac_sha1 Mac instance and initialize with the signing key
            Mac mac = Mac.getInstance("HmacSHA1");
            mac.init(signingKey);

            // Compute the hmac on input data bytes
            byte[] rawHmac = mac.doFinal(value.getBytes());

            String hmac = "";
            BigInteger hash = new BigInteger(1, rawHmac);
            hmac = hash.toString(16);
            if (hmac.length() % 2 != 0) {
                hmac = "0" + hmac;
            }
            return hmac;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    private static String encode(String string) {

        String encoded = "";
        byte[] stringArray;
        try {
            stringArray = string.getBytes("UTF-8"); // use appropriate encoding
            // string!
        } catch (Exception ignored) {
            stringArray = string.getBytes(); // use locale default rather than
            // croak
        }
        // determine how many padding bytes to add to the output
        int paddingCount = (3 - (stringArray.length % 3)) % 3;
        // add any necessary padding to the input
        stringArray = zeroPad(stringArray.length + paddingCount,
                stringArray);
        // process 3 bytes at a time, churning out 4 output bytes
        // worry about CRLF insertions later
        for (int i = 0; i < stringArray.length; i += 3) {
            int j = ((stringArray[i] & 0xff) << 16)
                    + ((stringArray[i + 1] & 0xff) << 8)
                    + (stringArray[i + 2] & 0xff);
            encoded = encoded + base64code.charAt((j >> 18) & 0x3f)
                    + base64code.charAt((j >> 12) & 0x3f)
                    + base64code.charAt((j >> 6) & 0x3f)
                    + base64code.charAt(j & 0x3f);
        }
        // replace encoded padding nulls with "="
        return splitLines(encoded.substring(0, encoded.length()
                - paddingCount)
                + "==".substring(0, paddingCount));

    }

    private static byte[] zeroPad(int length, byte[] bytes) {
        byte[] padded = new byte[length]; // initialized to zero by JVM
        System.arraycopy(bytes, 0, padded, 0, bytes.length);
        return padded;
    }

    private static String splitLines(String string) {

        String lines = "";
        for (int i = 0; i < string.length(); i += splitLinesAt) {

            lines += string.substring(i,
                    Math.min(string.length(), i + splitLinesAt));
            lines += "\r\n";

        }
        return lines;

    }
}

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