36 lines
1.3 KiB
Plaintext
36 lines
1.3 KiB
Plaintext
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using System;
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using System.Collections.Generic;
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using System.Security.Cryptography;
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using System.Text;
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using System.Text.RegularExpressions;
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using System.Web;
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namespace Landmarks_Import
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{
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public struct GoogleSignedUrl
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{
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public static string Sign(string url, string keyString)
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{
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ASCIIEncoding encoding = new ASCIIEncoding();
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// converting key to bytes will throw an exception, need to replace '-' and '_' characters first.
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string usablePrivateKey = keyString.Replace("-", "+").Replace("_", "/");
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byte[] privateKeyBytes = Convert.FromBase64String(usablePrivateKey);
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Uri uri = new Uri(url);
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byte[] encodedPathAndQueryBytes = encoding.GetBytes(uri.LocalPath + uri.Query);
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// compute the hash
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HMACSHA1 algorithm = new HMACSHA1(privateKeyBytes);
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byte[] hash = algorithm.ComputeHash(encodedPathAndQueryBytes);
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// convert the bytes to string and make url-safe by replacing '+' and '/' characters
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string signature = Convert.ToBase64String(hash).Replace("+", "-").Replace("/", "_");
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// Add the signature to the existing URI.
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return uri.Scheme + "://" + uri.Host + uri.LocalPath + uri.Query + "&signature=" + signature;
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}
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}
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}
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