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provider.go
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provider.go
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// Copyright 2021 PairMesh, Inc.
//
// Licensed 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 CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package sso
import (
"errors"
"fmt"
"math/rand"
"strings"
"sync"
"time"
"github.com/pairmesh/pairmesh/portal/config"
"github.com/pairmesh/pairmesh/portal/db/models"
"go.uber.org/zap"
)
// Vendor represents the current sso provider (github, ...)
type Vendor int
const (
GitHub Vendor = iota
)
const URIAuthCodeCallback = "/login/auth/callback"
var errIllegalParam = errors.New("illegal parameter(s)")
var vendorName = map[Vendor]string{
GitHub: "GitHub",
}
// String implements the fmt.Stringer interface
func (v Vendor) String() string {
n, found := vendorName[v]
if !found {
return fmt.Sprintf("unknown(%d)", v)
}
return strings.ToLower(n)
}
type Token struct {
AccessToken string
Raw map[string]string //extra data for diff platform
}
// Provider represents the sso vendor
type Provider interface {
Setup(cfg *config.SSO) error
AuthCodeURL(redirect, client string) string
AccessToken(code string) (*Token, error)
UserInfo(token *Token) (*models.User, bool, error)
}
type providerMgr struct {
sync.RWMutex
r *rand.Rand
providers map[Vendor]Provider
}
var gMgr = &providerMgr{
r: rand.New(rand.NewSource(time.Now().Unix())),
providers: make(map[Vendor]Provider),
}
func (pm *providerMgr) init(cfg *config.SSO) error {
for key, p := range pm.providers {
zap.L().Info("register the cfg", zap.Any("cfg", vendorName[key]))
if err := p.Setup(cfg); err != nil {
return err
}
}
return nil
}
func (pm *providerMgr) register(name Vendor, h Provider) error {
if h == nil {
return fmt.Errorf("the sso is nil")
}
pm.Lock()
defer pm.Unlock()
if _, ok := pm.providers[name]; ok {
return nil
}
pm.providers[name] = h
return nil
}
func (pm *providerMgr) provider(name Vendor) Provider {
pm.RLock()
defer pm.RUnlock()
if p, ok := pm.providers[name]; ok {
return p
}
return nil
}
func (pm *providerMgr) randString(len int) string {
bytes := make([]byte, len)
for i := 0; i < len; i++ {
b := pm.r.Intn(26) + 65
bytes[i] = byte(b)
}
return string(bytes)
}
// WithName returns the provider with the name
func WithName(name Vendor) Provider {
return gMgr.provider(name)
}
// Register register a provider with the name
func Register(name Vendor, p Provider) {
gMgr.register(name, p)
}
// Initialize init the provider(s) successfully, if not, crash it
func Initialize(sso *config.SSO) error {
if sso == nil {
return errIllegalParam
}
return gMgr.init(sso)
}
// NextState generate a new oauth2's state code
func NextState() string {
return gMgr.randString(8)
}
// Link represents a sso vendor name & the auth code link pair
type Link struct {
Name string
Link string
}
// AuthCodeLinks generates the all sso vendor name & the auth code link pairs
// If the node port equals `0`, which means the login request is not started
// from the PairMesh node.
func AuthCodeLinks(redirect string, client string) []Link {
//sort for html render
names := []Vendor{
GitHub,
// Other 3rd providers...
}
var ret []Link
for _, v := range names {
url := gMgr.provider(v).AuthCodeURL(redirect, client)
ret = append(ret, Link{
Name: vendorName[v],
Link: url,
})
}
return ret
}