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A.D.L.R. is a project that attempts to Automate Dependency License Requirements for Golang projects

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# A.D.L.R.
### **A**utomating **D**ependency **L**icense **R**equirements

[![GoDoc](https://godoc.org/github.com/blocky/adlr?status.svg)](https://godoc.org/github.com/blocky/adlr)
[![Build Status](https://www.travis-ci.com/blocky/adlr.svg?token=JczzdP6eMqmEqysZ8pDf&branch=main)](https://www.travis-ci.com/blocky/adlr)
[![Go Report Card](https://goreportcard.com/badge/github.com/blocky/adlr)](https://goreportcard.com/report/github.com/blocky/adlr)

ADLR is a project that attempts to automate fulfillment of golang module dependency license requirements in a lock file suitable for vcs.

For our dependencies and their licenses, see [license.lock](license.lock)

# Disclaimer
**The ADLR project offers no legal advice or license compliance guarantee. It is your responsibility to ensure compliance with licenses you interact with**

# Overview
## ADLR's License Lock
ADLR creates a license lock file. This is a readable and manually edittable json file of your directly imported golang dependencies and their licenses. It is much like a `go.mod`, and you can save this file in your version control system. Some benefits of this:
+ monitor imports' licenses across versions
+ automate listing *copyrights*|*permissions*|*warranties* for licenses in your source code

## Get ADLR
`go get github.com/blocky/adlr/...`

## ADLR and Distributable Inclusion
Automate a license information command for your distributable with your license lock file

### Linker Flag
1. Serialize the lock file _(Go Linker flag requires strings to have no spaces or newlines)_
2. Pass to a variable in your code with the `-ldflags` build flag
3. Deserialize and unmarshal for license information command(s)

### Go 1.16 File Embedding
1. Embed your license lock file with an embed directive:
```golang
\\go:embed license.lock
var DependencyRequirements []byte
```
2. Unmarshal for license information command(s)

An example of this is built in to the repo. See `main.go`and the `cmd/` folder for details. Or test out ADLR's `about license(s)` commands with `go get` or `make build`.

# ADLR Process
## Your Golang Module buildlist
Using the command in your golang module:
```sh
$ go list -m -json all > buildlist.json
```
you can generate a json list of all golang modules/projects required to build your module.
If your project is complex this list can be long. Currently, ADLR filters for directly imported modules only.
```golang
buildlist, err := os.Open("./buildlist.json")
...
defer buildlist.Close()

parser := gotool.MakeBuildListParser()
mods, err := parser.ParseModuleList(buildlist)
...

direct := gotool.FilterDirectImportModules(mods)
```

## Text Mining Licenses
Unfortunately, golang does not yet have a standard for module license files. There names can be lowercase, uppercase, with or without a file extension, or not even named "license", such as "COPYLEFT". To solve this, ADLR uses text mining to prospect potential license file matches and their confidences with https://github.com/go-enry/go-license-detector.
```golang
direct := gotool.FilterDirectImportModules(mods)

prospects := adlr.MakeProspects(direct...)
prospector := adlr.MakeProspector()
mines, err := prospector.Prospect(prospects...)
...
```

## Automatically Determining License
From prospecting, one or multiple matches are returned for a golang module with license type, file name, and confidence. With preset confidence values, ADLR attempts to automatically determine the license for each golang module. If a license cannot be determined through mining, the license lock manager may be able to automatically determine it (only if a license lock file has already been created).
```golang
mines, err := prospector.Prospect(prospects...)
...

miner := adlr.MakeMiner()
locks, err := miner.Mine(mines...)
if err != nil && Verbose {
	fmt.Println(err)
}
```

## Locking Dependencies and their Licenses
After mining, licenses are hopefully automatically determined. These are now ready to be locked into a file. For no pre-existing license lock, a new file is created. For an existing license lock, the new and old list of dependencies are merged.

New dependencies take priority, and will fill the lock file. But for new locks that are missing license fields, merging is attempted with pre-existing locks. For new locks that cannot be automatically resolved, the license lock manager will print them in stderr, asking for manual editting of the license lock file. These license edits will persist for that dependency.
```golang
locks, err := miner.Mine(mines...)
...

licenselock := adlr.MakeLicenseLockManager("./")
err = licenselock.Lock(locks...)
...
```

## Auditing Locked License types
After locking, dependencies and their licenses have been written to the lock file. But unwanted license types may have slipped through. The auditing step will search through the lock file, checking license types against a whitelist. For any types not listed, an error is returned listing bad license types, and requesting whitelist inclusion or dependency removal.
```golang
licenselock := adlr.MakeLicenseLockManager("./")
err = licenselock.Lock(locks...)
...

locks, err = licenselock.Read()
...

whitelist := adlr.MakeWhitelist([]string{"A","B","C"...})
auditor := adlr.MakeAuditor(whitelist)
err = auditor.Audit(locks...)
...
```
# Development
Contributions are welcome! Contact BLOCKY through our website [www.blocky.rocks](www.blocky.rocks) or email **ian@blocky.rocks**

## Branch Practices
### Branches
+ **feature/**: Used for adding features, increments semver x.**y**.z
+ **bugfix/**: Used for fixing bugs, increments semver x.y.**z**
+ **chore/**: Used for small chores, tasks, etc and does not usually result in a semver increase/release

### Main & Develop
Due to recent errors in PR merges to the main branch, *all PR's must initially merge into the* **develop branch**, **checked for bugs**, *then a PR merging* **develop's** *changes into* **main**

### Squash Merging
We use squash merging for PR's. Therefore, not all of your commits are required to pass testing **besides your the last commit**

## Dependencies for testing
Mockery - mockery v1 is used to autogenerate code for golang interfaces. Mocked interfaces are outputted to the `internal/mocks/` folder. The golang binary tool can be downloaded from https://github.com/vektra/mockery

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