Generate License Key Using Kotlin

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by dempcatucae1982 2021. 1. 8. 23:11

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I was working on a project recently that required unique API keys to be generated for clients connecting to the server. For various reasons, I settled on the style of license key you commonly see for software packages. You know, the kind you always had to read off the back of a CD case and type in when installing the application. Like H8OV7-HNTB5-JLLOH-W8FG2.

May 01, 2019 This library generates TypeScript definitions that cover a set of Kotlin and Java classes using Kotlin reflection. TypeScript definitions are useful when data classes are serialized to JSON and handled in a JavaScript or TypeScript web frontend as they enable context-aware type checking and autocompletion in a number of IDEs and editors.

It’s fairly easy to write such a function. The basic idea is to loop around four times—once for each segment—and have a nested loop that runs five times, picking a random character each time. Here’s what I came up with:

Kotlin Usage

The $tokens string contains the characters that are valid in the key, so the loop can pick from it. The $segment_chars and $num_segments variables are the number of characters in a segment and the number of segments in the key, respectively. $key_string is an empty string that the loop will add the characters into.

The first for loop runs four times, assuming the desired result is four segments in the key. The inner loop picks a character out of $tokens at random each time it goes around. (PHP strings are also arrays, with the each character having its own numerical offset.) The characters are tacked onto the $segment string.

Then the segment is joined with the $key_string, and a dash character is applied if the loop isn’t on the final segment yet. End result: something like H8OV7-HNTB5-JLLOH-W8FG2.

Now how can you make sure the key is unique when it’s generated?

You generate a new key string with the function, check to see if it exists in your database, and lather/rinse/repeat until that is no longer the case. Usually you won’t have collisions too often, so it will only need to run once. I’m too lazy to figure out the probability, but considering there are 52,521,875 possible combinations for one 5-character segment…you’re probably not going to run into performance issues anytime soon. And if you do, just add another segment onto your key strings.

The Apache 2 license (given in full in LICENSE.txt) applies to all code in this repository which is copyrightby JetBrains. The following sections of the repository contain third-party code, to which different licensesmay apply:

Kotlin Compiler

The following modules contain third-party code and are incorporated into the Kotlin compiler and/orthe Kotlin IntelliJ IDEA plugin:

Path: compiler/backend/src/org/jetbrains/kotlin/codegen/inline/MaxStackFrameSizeAndLocalsCalculator.java
- License: BSD (license/third_party/asm_license.txt)
- Origin: Derived from ASM: a very small and fast Java bytecode manipulation framework, Copyright (c) 2000-2011 INRIA, France Telecom
Path: compiler/backend/src/org/jetbrains/kotlin/codegen/inline/MaxLocalsCalculator.java
- License: BSD (license/third_party/asm_license.txt)
- Origin: Derived from ASM: a very small and fast Java bytecode manipulation framework, Copyright (c) 2000-2011 INRIA, France Telecom
Path: compiler/backend/src/org/jetbrains/kotlin/codegen/optimization/common/MethodAnalyzer.kt
- License: BSD (license/third_party/asm_license.txt)
- Origin: Derived from ASM: a very small and fast Java bytecode manipulation framework, Copyright (c) 2000-2011 INRIA, France Telecom
Path: core/reflection.jvm/src/kotlin.reflect/jvm/internal/pcollections
- License: MIT (license/third_party/pcollections_LICENSE.txt)
- Origin: Derived from PCollections, A Persistent Java Collections Library (https://pcollections.org/)
Path: eval4j/src/org/jetbrains/eval4j/interpreterLoop.kt
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- License: BSD (license/third_party/asm_license.txt)
- Origin: Derived from ASM: a very small and fast Java bytecode manipulation framework, Copyright (c) 2000-2011 INRIA, France Telecom
Path: compiler/backend/src/org/jetbrains/kotlin/codegen/optimization/common/OptimizationBasicInterpreter.java
- License: BSD (license/third_party/asm_license.txt)
- Origin: Derived from ASM: a very small and fast Java bytecode manipulation framework, Copyright (c) 2000-2011 INRIA, France Telecom
Path: js/js.ast
- License: BSD (license/third_party/dart_LICENSE.txt)
- Origin: Originally part of the Dart compiler, (c) 2011 the Dart Project Authors,
Path: js/js.inliner/src/org/jetbrains/kotlin/js/inline/FunctionInlineMutator.kt
- License: BSD (license/third_party/dart_LICENSE.txt)
- Origin: Originally part of the Dart compiler, (c) 2011 the Dart Project Authors,
Path: js/js.parser/src/com/google
- License: Netscape Public License 1.1 (license/third_party/rhino_LICENSE.txt)
- Origin: Originally part of GWT, (C) 2007-08 Google Inc., distributed under the Apache 2 license. The codeis derived from Rhino, (C) 1997-1999 Netscape Communications Corporation, distributed under theNetscape Public License.
Path: js/js.translator/qunit/qunit.js
- License: MIT (license/third_party/qunit_license.txt)
- Origin: QUnit, Copyright (c) 2012 John Resig, Jörn Zaefferer,
Path: libraries/stdlib/src/kotlin/collections
- License: Apache 2 (license/third_party/gwt_license.txt)
- Origin: Derived from GWT, (C) 2007-08 Google Inc.
Path: libraries/stdlib/unsigned/src/kotlin/UnsignedUtils.kt
- License: Apache 2 (license/third_party/guava_license.txt)
- Origin: Derived from Guava's UnsignedLongs, (C) 2011 The Guava Authors
Path: libraries/stdlib/jvm/src/kotlin/util/MathJVM.kt
- License: Boost Software License 1.0 (license/third_party/boost_LICENSE.txt)
- Origin: Derived from boost special math functions, Copyright Eric Ford & Hubert Holin 2001.
Path: libraries/stdlib/js/src/kotlin/collections
- License: Apache 2 (license/third_party/gwt_license.txt)
- Origin: Derived from GWT, (C) 2007-08 Google Inc.
Path: libraries/stdlib/js-v1/src/js/long.js
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- License: Apache 2 (license/third_party/closure-compiler_LICENSE.txt)
- Origin: Google Closure Library, Copyright 2009 The Closure Library Authors
Path: libraries/stdlib/js-v1/src/js/polyfills.js
Used in conjunction with each other, it is unlikely that you will encounter a video you are unable to play, and by using the alternative tools - such as Real Alternative - you can benefit from improved p3rformance.The codecs included in the pack can also be used when encoding your own videos and there are a number of handy tools which may well come in useful - such as a bitrate calculator, subtitling tool, video splitters and much more. Thankfully, it is not necessary to install all of the codecs at once if you do not need to - you can pick and choose the ones you need, adding others at a later date if necessary. Rather than waiting until the last minute, install the K-Lite Mega Codec Pack which includes a wide range of popular codecs for a number of different video formats.As well as well known formats such as XviD, MPEG2 and DivX, the pack also includes audio codecs and a selection of alternative media players. The pack includes such a large number of tools and codecs, there is simply not space to cover them all in any details. https://standardbrown126.weebly.com/blog/k-lite-codec-pack-full-download-mac.
- License: Boost Software License 1.0 (license/third_party/boost_LICENSE.txt)
- Origin: Derived from boost special math functions, Copyright Eric Ford & Hubert Holin 2001.
Path: plugins/lint/android-annotations
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- License: Apache 2 (license/third_party/aosp_license.txt)
- Origin: Copyright (C) 2011-15 The Android Open Source Project
Path: plugins/lint/lint-api
- License: Apache 2 (license/third_party/aosp_license.txt)
- Origin: Copyright (C) 2011-15 The Android Open Source Project
Path: plugins/lint/lint-checks
- License: Apache 2 (license/third_party/aosp_license.txt)
- Origin: Copyright (C) 2011-15 The Android Open Source Project
Path: plugins/lint/lint-idea
- License: Apache 2 (license/third_party/aosp_license.txt)
- Origin: Copyright (C) 2011-15 The Android Open Source Project
Path: idea/idea-gradle-tooling-api/src/org/gradle/tooling/model/kotlin/dsl- License: Apache 2 (license/third_party/gradle_license.txt)- Origin: Gradle, Copyright 2002-2017 Gradle, Inc.

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