feat: Implement github SDK with access token support

[asvinours]

fixes #132 and #133

changes summary:

• Replace anonymous HTTP call with an implementation of the GitHub SDK
  • Add support for authenticated GitHub requests using access token
• Upgrade go to 1.19
• Remove the proxy
  • Retrieve the list of versions from GitHub instead of https://warrensbox.github.io/terragunt-versions-list/index.json
  • Download release assets directly from GitHub API

tgswitch$ go run .
2023/01/14 11:56:02 Unable to make request. Please try again.
exit status 1

tgswitch$ GITHUB_AUTH_TOKEN="ghp_[...]" go run .
✔ 0.38.1
Installing terragrunt at /home/fbaumann/bin
Downloading https://github.com/gruntwork-io/terragrunt/releases/download/v0.38.1/terragrunt_linux_amd64 to terragrunt_linux_amd64
Downloading ...
35337033 bytes downloaded.
Switched terragrunt to version "0.38.1"

make test output

go build -v -ldflags "-X main.version=" -o tgswitch github.com/warrensbox/tgswitch
mkdir -vp ./build
mv tgswitch ./build
go test -v ./...
=== RUN   TestMain
=== RUN   TestMain/User_should_exist
    main_test.go:19: Current user exist: /home/fbaumann  [expected]
--- PASS: TestMain (0.00s)
    --- PASS: TestMain/User_should_exist (0.00s)
PASS
ok  	github.com/warrensbox/tgswitch	(cached)
=== RUN   TestNewCommand
    command_test.go:17: Value returned is a pointer &{terragrunt} [expected]
--- PASS: TestNewCommand (0.00s)
=== RUN   TestPathList
    command_test.go:33: Found bin path [expected]
--- PASS: TestPathList (0.00s)
=== RUN   TestFind
--- PASS: TestFind (0.02s)
=== RUN   TestDownloadFromURL_FileNameMatch
Current user: /home/fbaumann 
Downloading https://github.com/gruntwork-io/terragrunt/releases/download/v0.13.9/terragrunt_linux_amd64 to terragrunt_linux_amd64
Downloading ...
15276607 bytes downloaded.
    download_test.go:63: Expected file /home/fbaumann/.terragrunt.versions_test/terragrunt_linux_amd64
    download_test.go:64: Downloaded file /home/fbaumann/.terragrunt.versions_test/terragrunt_linux_amd64
    download_test.go:65: Download file matches expected file
Downloading https://github.com/gruntwork-io/terragrunt/releases/download/v0.14.11/terragrunt_linux_amd64 to terragrunt_linux_amd64
Downloading ...
16535740 bytes downloaded.
    download_test.go:80: Expected file name /home/fbaumann/.terragrunt.versions_test/terragrunt_linux_amd64
    download_test.go:81: Downloaded file name /home/fbaumann/.terragrunt.versions_test/terragrunt_linux_amd64
    download_test.go:82: Download file name matches expected file
--- PASS: TestDownloadFromURL_FileNameMatch (2.00s)
=== RUN   TestDownloadFromURL_FileExist
Current user: /home/fbaumann 
2023/01/14 11:51:27 Creating directory for terragrunt: /home/fbaumann/.terragrunt.versions_test/
Downloading https://github.com/gruntwork-io/terragrunt/releases/download/v0.13.9/terragrunt_linux_amd64 to terragrunt_linux_amd64
Downloading ...
15276607 bytes downloaded.
    download_test.go:133: Expected file /home/fbaumann/.terragrunt.versions_test/terragrunt_linux_amd64
    download_test.go:134: Downloaded file /home/fbaumann/.terragrunt.versions_test/terragrunt_linux_amd64
    download_test.go:135: Download file matches expected file
Downloading https://github.com/gruntwork-io/terragrunt/releases/download/v0.14.11/terragrunt_linux_amd64 to terragrunt_linux_amd64
Downloading ...
16535740 bytes downloaded.
    download_test.go:150: Expected file /home/fbaumann/.terragrunt.versions_test/terragrunt_linux_amd64
    download_test.go:151: Downloaded file /home/fbaumann/.terragrunt.versions_test/terragrunt_linux_amd64
    download_test.go:152: Download file matches expected file
--- PASS: TestDownloadFromURL_FileExist (1.02s)
=== RUN   TestDownloadFromURL_Valid
    download_test.go:171: Valid URL from https://github.com/gruntwork-io/terragrunt/releases/download/
--- PASS: TestDownloadFromURL_Valid (0.00s)
=== RUN   TestRenameFile
2023/01/14 11:51:28 Creating directory for terragrunt: /home/fbaumann/.terragrunt.versions_test/
==> done creating file /home/fbaumann/.terragrunt.versions_test/terragrunt
    files_test.go:39: File exist /home/fbaumann/.terragrunt.versions_test/terragrunt
    files_test.go:48: New file exist /home/fbaumann/.terragrunt.versions_test/terragrunt_0.0.7
    files_test.go:58: Old file does not exist /home/fbaumann/.terragrunt.versions_test/terragrunt
--- PASS: TestRenameFile (0.00s)
=== RUN   TestRemoveFiles
2023/01/14 11:51:28 Creating directory for terragrunt: /home/fbaumann/.terragrunt.versions_test/
==> done creating file /home/fbaumann/.terragrunt.versions_test/terragrunt
    files_test.go:82: File exist /home/fbaumann/.terragrunt.versions_test/terragrunt
    files_test.go:94: Old file does not exist /home/fbaumann/.terragrunt.versions_test/terragrunt
--- PASS: TestRemoveFiles (0.00s)
=== RUN   TestCreateDirIfNotExist
    files_test.go:114: Directory should not exist /home/fbaumann/.terragrunt.versions_test/ (expected)
2023/01/14 11:51:28 Creating directory for terragrunt: /home/fbaumann/.terragrunt.versions_test/
    files_test.go:121: Creating directory /home/fbaumann/.terragrunt.versions_test/
    files_test.go:124: Directory exist /home/fbaumann/.terragrunt.versions_test/ (expected)
--- PASS: TestCreateDirIfNotExist (0.00s)
=== RUN   TestWriteLines
2023/01/14 11:51:28 Creating directory for terragrunt: /home/fbaumann/.terragrunt.versions_test/
    files_test.go:196: Write versions exist (expected)
--- PASS: TestWriteLines (0.00s)
=== RUN   TestReadLines
2023/01/14 11:51:28 Creating directory for terragrunt: /home/fbaumann/.terragrunt.versions_test/
    files_test.go:250: Read versions exist (expected)
--- PASS: TestReadLines (0.00s)
=== RUN   TestIsDirEmpty
    files_test.go:270: Create test dir: 2023-01-14 
2023/01/14 11:51:28 Creating directory for terragrunt: /home/fbaumann/.terragrunt.versions_test/
2023/01/14 11:51:28 Creating directory for terragrunt: /home/fbaumann/.terragrunt.versions_test//2023-01-14
    files_test.go:278: Expected directory to be empty /home/fbaumann/.terragrunt.versions_test//2023-01-14 [expected]
    files_test.go:281: Directory empty
--- PASS: TestIsDirEmpty (0.00s)
=== RUN   TestCheckDirHasTGBin
2023/01/14 11:51:28 Creating directory for terragrunt: /home/fbaumann/.terragrunt.versions_test/
==> done creating file /home/fbaumann/.terragrunt.versions_test/terragrunt_linux_amd64
    files_test.go:312: Expected directory to have tg file /home/fbaumann/.terragrunt.versions_test/terragrunt_linux_amd64 [expected]
    files_test.go:315: Directory empty
--- PASS: TestCheckDirHasTGBin (0.00s)
=== RUN   TestInstall
=== RUN   TestInstall/User_should_exist
    install_test.go:20: Current user exist: /home/fbaumann  [expected]
--- PASS: TestInstall (0.00s)
    --- PASS: TestInstall/User_should_exist (0.00s)
=== RUN   TestRemoveDuplicateVersions
    list_versions_test.go:20: Write versions exist (expected)
--- PASS: TestRemoveDuplicateVersions (0.00s)
=== RUN   TestValidVersionFormat
    list_versions_test.go:34: Valid version format : 0.11.8 (expected)
    list_versions_test.go:44: Valid version format : 1.11.9 (expected)
Invalid terragrunt version format. Format should be #.#.# or #.#.#-@# where # is numbers and @ is word characters. For example, 0.11.7 and 0.11.9-beta1 are valid versions
    list_versions_test.go:54: Invalid version format : 1.11.a (expected)
Invalid terragrunt version format. Format should be #.#.# or #.#.#-@# where # is numbers and @ is word characters. For example, 0.11.7 and 0.11.9-beta1 are valid versions
    list_versions_test.go:64: Invalid version format : 22323 (expected)
Invalid terragrunt version format. Format should be #.#.# or #.#.#-@# where # is numbers and @ is word characters. For example, 0.11.7 and 0.11.9-beta1 are valid versions
    list_versions_test.go:74: Invalid version format : @^&*!)! (expected)
    list_versions_test.go:84: Valid version format : 1.11.9-beta1 (expected)
    list_versions_test.go:94: Valid version format : 0.12.0-rc2 (expected)
    list_versions_test.go:104: Valid version format : 1.11.4-boom (expected)
Invalid terragrunt version format. Format should be #.#.# or #.#.#-@# where # is numbers and @ is word characters. For example, 0.11.7 and 0.11.9-beta1 are valid versions
    list_versions_test.go:114: Invalid version format : 1.11.4-1 (expected)
--- PASS: TestValidVersionFormat (0.00s)
=== RUN   TestCreateSymlink
    symlink_test.go:30: Symlink does not exist  [expected]
    symlink_test.go:41: Symlink exist /home/fbaumann/test-tgswitch-dest [expected]
--- PASS: TestCreateSymlink (0.00s)
=== RUN   TestRemoveSymlink
    symlink_test.go:68: Symlink does exist  [expected]
    symlink_test.go:69: Creating symlink
    symlink_test.go:82: Symlink was removed   [expected]
--- PASS: TestRemoveSymlink (0.00s)
=== RUN   TestCheckSymlink
    symlink_test.go:103: Creating symlink
    symlink_test.go:112: Symlink does exist  [expected]
--- PASS: TestCheckSymlink (0.00s)
PASS
ok  	github.com/warrensbox/tgswitch/lib	(cached)

[mholttech]

I prefer the current mechanism of using https://warrensbox.github.io/terragunt-versions-list/index.json which is generated from https://github.com/warrensbox/terragunt-versions-list

The Github API has usage restrictions when not authenticated and my organization doesn't use github so managing github credentials for this would be difficult. If this is popular, I would suggest making it an option to use this instead of the Proxy but not replace it outright.