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[MOB-22458][MOB-22611] Cleanup StringEncoder util (#729)
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50 changes: 50 additions & 0 deletions
50
code/core/src/main/java/com/adobe/marketing/mobile/internal/util/StringExtensions.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| /* | ||
| Copyright 2024 Adobe. All rights reserved. | ||
| This file is licensed to you under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. You may obtain a copy | ||
| of the License at http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software distributed under | ||
| the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS | ||
| OF ANY KIND, either express or implied. See the License for the specific language | ||
| governing permissions and limitations under the License. | ||
| */ | ||
|
|
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| package com.adobe.marketing.mobile.internal.util | ||
|
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| /** | ||
| * Computes the signed 2's complement FNV-1a 32-bit hash for the given string input. | ||
| * | ||
| * <p>https://en.wikipedia.org/wiki/Fowler%E2%80%93Noll%E2%80%93Vo_hash_function Online | ||
| * validator - https://md5calc.com/hash/fnv1a32?str= | ||
| * | ||
| * @param input The string to be hashed. | ||
| * @return A 32-bit signed integer representing the FNV-1a hash of the input string. | ||
| */ | ||
| private fun computeFnv1aHash(input: String?): Int { | ||
| val ALL_BITS_ENABLED = 0xFF | ||
| val PRIME = 0x1000193 // 16777619 as hex | ||
| val OFFSET = -0x7ee3623b // 2166136261 as hex | ||
|
|
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| if (input == null) { | ||
| return 0 | ||
| } | ||
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| var hash = if (input.trim().isEmpty()) 0 else OFFSET | ||
| val bytes = input.toByteArray() | ||
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| for (aByte in bytes) { | ||
| hash = hash xor (aByte.toInt() and ALL_BITS_ENABLED) | ||
| hash *= PRIME | ||
| } | ||
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| return hash | ||
| } | ||
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| /** | ||
| * Extension function that computes the decimal FNV-1a 32-bit hash for a string. | ||
| * | ||
| * @return The decimal representation of the FNV-1a 32-bit hash. | ||
| */ | ||
| internal fun String?.fnv1a32(): Long { | ||
| return computeFnv1aHash(this).toUInt().toLong() | ||
| } |
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56 changes: 56 additions & 0 deletions
56
code/core/src/main/java/com/adobe/marketing/mobile/util/StringEncoder.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,56 @@ | ||
| /* | ||
| Copyright 2024 Adobe. All rights reserved. | ||
| This file is licensed to you under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. You may obtain a copy | ||
| of the License at http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software distributed under | ||
| the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS | ||
| OF ANY KIND, either express or implied. See the License for the specific language | ||
| governing permissions and limitations under the License. | ||
| */ | ||
|
|
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| package com.adobe.marketing.mobile.util | ||
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| import com.adobe.marketing.mobile.internal.CoreConstants | ||
| import com.adobe.marketing.mobile.services.Log | ||
| import java.nio.charset.StandardCharsets | ||
| import java.security.MessageDigest | ||
| import java.security.NoSuchAlgorithmException | ||
|
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| object StringEncoder { | ||
| private const val LOG_TAG = "StringEncoder" | ||
| private const val LSB_8_MASK = 0xFF | ||
|
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| /** | ||
| * Computes the sha2 hash for the string | ||
| * | ||
| * @param input the string for which sha2 hash is to be computed | ||
| * @return sha2 hash result if the string is valid, null otherwise | ||
| */ | ||
| @JvmStatic | ||
| fun sha2hash(input: String?): String? { | ||
| if (input.isNullOrEmpty()) { | ||
| return null | ||
| } | ||
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| try { | ||
| val messageDigest = MessageDigest.getInstance("SHA-256").apply { | ||
| update(input.toByteArray(StandardCharsets.UTF_8)) | ||
| }.digest() | ||
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| val sha2HexBuilder = StringBuilder() | ||
| for (aMessageDigest in messageDigest) { | ||
| val hexString = String.format("%02x", LSB_8_MASK and aMessageDigest.toInt()) | ||
| sha2HexBuilder.append(hexString) | ||
| } | ||
| return sha2HexBuilder.toString() | ||
| } catch (e: NoSuchAlgorithmException) { | ||
| Log.debug( | ||
| CoreConstants.LOG_TAG, LOG_TAG, | ||
| "Failed to create SHA-256 hash for input: '$input', Error: $e" | ||
| ) | ||
| } | ||
|
|
||
| return null | ||
| } | ||
| } |
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