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vendor/github.com/felipeweb/osin-mysql/README.md

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+# osin-mysql 
+
+![Travis](https://travis-ci.org/felipeweb/osin-mysql.svg?branch=master) [![GoDoc](https://godoc.org/github.com/felipeweb/osin-mysql?status.svg)](https://godoc.org/github.com/felipeweb/osin-mysql)
+
+A MySQL storage backend for [osin oauth2](https://github.com/RangelReale/osin).
+Additional to implementing the `osin.Storage` interface, the `github.com/felipeweb/osin-mysql/storage.Storage` interface defines new methods:
+
+```
+// CreateClient stores the client in the database and returns an error, if something went wrong.
+CreateClient(client osin.Client) error
+
+// UpdateClient updates the client (identified by its id) and replaces the values with the values of client.
+// Returns an error if something went wrong.
+UpdateClient(client osin.Client) error
+
+// RemoveClient removes a client (identified by id) from the database. Returns an error if something went wrong.
+RemoveClient(id string) error
+```
+
+## Encrypt your tokens
+
+Unfortunately, the osin library offers little capabilities for storing credentials like access or refresh tokens in a
+hashed or encrypted way. An attacker could gain access to your database through various attack vectors, steal these
+tokens and gain, for example, administrative access to your application.
+
+Please be aware, that this library stores all data as-is and does not perform any sort of encryption or hashing.
+
+## Usage
+
+First, install this library with `go get "github.com/felipeweb/osin-mysql"`.
+
+```go
+import (
+	"database/sql"
+	_ "github.com/go-sql-driver/mysql"
+
+	"github.com/felipeweb/osin-mysql"
+	"github.com/RangelReale/osin"
+)
+
+func main() {
+    url := "user:password@tcp(host:3306)/dbname?parseTime=true"
+    db, err := sql.Open("mysql", url)
+    if err != nil {
+        return nil, err
+    }
+
+    store := mysql.New(db,"osin_")
+    store.CreateSchemas()
+    server := osin.NewServer(osin.NewServerConfig(), store)
+
+    // See the osin documentation for more information
+    // e.g.: server.HandleAuthorizeRequest(resp, r)
+}
+```
+
+## Limitations
+
+TL;DR `AuthorizeData`'s `Client`'s and `AccessData`'s `UserData` field must be string due to language restrictions or an error will be thrown.
+
+In osin, Client, AuthorizeData and AccessData have a `UserData` property of type `interface{}`. This does not work well
+with SQL, because it is not possible to gob decode or unmarshall the data back, since the concrete type is not known.
+Because osin's storage interface does not support setting the UserData type, **this library tries to convert UserData to string
+and return it as such.** With this, you could for example gob encode (use e.g. base64 encode for SQL storage type compatibility)
+the data before passing it to e.g. `FinishAccessRequest` and decode it when needed.
+
+# 2016-10-23 BREAKING CHANGES
+- Now `New()` recives a db object and a table prefix as parameter