feat: adding auth library for m2m token generation

go.work.sum

@@ -270,6 +270,7 @@ github.com/coreos/go-systemd/v22 v22.3.2/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSV
 github.com/cpuguy83/go-md2man/v2 v2.0.5 h1:ZtcqGrnekaHpVLArFSe4HK5DoKx1T0rq2DwVB0alcyc=
 github.com/cpuguy83/go-md2man/v2 v2.0.5/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/creack/pty v1.1.9 h1:uDmaGzcdjhF4i/plgjmEsriH11Y0o7RKapEf/LDaM3w=
+github.com/decred/dcrd/crypto/blake256 v1.0.1/go.mod h1:2OfgNZ5wDpcsFmHmCK5gZTPcCXqlm2ArzUIkw9czNJo=
 github.com/envoyproxy/go-control-plane v0.13.0 h1:HzkeUz1Knt+3bK+8LG1bxOO/jzWZmdxpwC51i202les=
 github.com/envoyproxy/go-control-plane v0.13.0/go.mod h1:GRaKG3dwvFoTg4nj7aXdZnvMg4d7nvT/wl9WgVXn3Q8=
 github.com/fatih/color v1.14.1/go.mod h1:2oHN61fhTpgcxD3TSWCgKDiH1+x4OiDVVGH8WlgGZGg=
@@ -388,7 +389,6 @@ golang.org/x/net v0.26.0/go.mod h1:5YKkiSynbBIh3p6iOc/vibscux0x38BZDkn8sCUPxHE=
 golang.org/x/net v0.28.0/go.mod h1:yqtgsTWOOnlGLG9GFRrK3++bGOUEkNBoHZc8MEDWPNg=
 golang.org/x/oauth2 v0.23.0 h1:PbgcYx2W7i4LvjJWEbf0ngHV6qJYr86PkAV3bXdLEbs=
 golang.org/x/oauth2 v0.23.0/go.mod h1:XYTD2NtWslqkgxebSiOHnXEap4TF09sJSc7H1sXbhtI=
-golang.org/x/oauth2 v0.24.0/go.mod h1:XYTD2NtWslqkgxebSiOHnXEap4TF09sJSc7H1sXbhtI=
 golang.org/x/sync v0.7.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
 golang.org/x/sys v0.21.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/sys v0.22.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
@@ -428,7 +428,6 @@ google.golang.org/genproto/googleapis/rpc v0.0.0-20241113202542-65e8d215514f/go.
 google.golang.org/grpc v1.67.1/go.mod h1:1gLDyUQU7CTLJI90u3nXZ9ekeghjeM7pTDZlqFNg2AA=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
 google.golang.org/protobuf v1.33.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
-google.golang.org/protobuf v1.34.2/go.mod h1:qYOHts0dSfpeUzUFpOMr/WGzszTmLH+DiWniOlNbLDw=
 google.golang.org/protobuf v1.35.1/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=

libs/backend/auth/go.mod

@@ -1,3 +1,23 @@
 module libs/backend/auth
 
 go 1.23
+
+require github.com/auth0/go-auth0 v1.13.1
+
+require (
+	github.com/PuerkitoBio/rehttp v1.4.0 // indirect
+	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.3.0 // indirect
+	github.com/goccy/go-json v0.10.3 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/lestrrat-go/blackmagic v1.0.2 // indirect
+	github.com/lestrrat-go/httpcc v1.0.1 // indirect
+	github.com/lestrrat-go/httprc v1.0.6 // indirect
+	github.com/lestrrat-go/iter v1.0.2 // indirect
+	github.com/lestrrat-go/jwx/v2 v2.1.3 // indirect
+	github.com/lestrrat-go/option v1.0.1 // indirect
+	github.com/segmentio/asm v1.2.0 // indirect
+	go.devnw.com/structs v1.0.0 // indirect
+	golang.org/x/crypto v0.29.0 // indirect
+	golang.org/x/oauth2 v0.24.0 // indirect
+	golang.org/x/sys v0.27.0 // indirect
+)

libs/backend/auth/go.sum

@@ -0,0 +1,66 @@
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+github.com/aybabtme/iocontrol v0.0.0-20150809002002-ad15bcfc95a0/go.mod h1:6L7zgvqo0idzI7IO8de6ZC051AfXb5ipkIJ7bIA2tGA=
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+github.com/decred/dcrd/dcrec/secp256k1/v4 v4.3.0/go.mod h1:v57UDF4pDQJcEfFUCRop3lJL149eHGSe9Jvczhzjo/0=
+github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
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+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
+github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
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libs/backend/auth/m2m/m2m.go

@@ -0,0 +1,137 @@
+package m2m
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"sync"
+	"time"
+
+	"github.com/auth0/go-auth0/authentication"
+)
+
+// Assertion of the proper interface
+var _ M2MGenerator = (*M2M)(nil)
+
+const (
+	audience          string = "https://career-cue-auth-api.com"
+	clientCredentials string = "client_credentials"
+)
+
+type M2MGenerator interface {
+	GetToken() (Token, error)
+}
+
+type M2M struct {
+	domain       string
+	clientID     string
+	clientSecret string
+	auth         *authentication.Authentication
+	mu           *sync.RWMutex
+	token        Token
+}
+
+type tokenRequestBody struct {
+	ClientID     string `json:"client_id"`
+	ClientSecret string `json:"client_secret"`
+	Audience     string `json:"audience"`
+	GrantType    string `json:"grant_type"`
+}
+
+type tokenResponseBody struct {
+	AccessToken string `json:"access_token"`
+	ExpiresIn   int64  `json:"expires_in"`
+	TokenType   string `json:"token_type"`
+}
+
+type Token struct {
+	accessToken string
+	expiresIn   time.Time
+	tokenType   string
+}
+
+func (t Token) IsExpired() bool {
+	now := time.Now().UTC()
+	return t.expiresIn.Before(now)
+}
+
+func (t Token) IsZero() bool {
+	return t.expiresIn.IsZero()
+}
+
+func (t Token) GetHeaderValue() string {
+	return fmt.Sprintf("%s %s", t.tokenType, t.accessToken)
+}
+
+func NewM2M(auth0Domain, auth0ClientID, auth0ClientSecret string) (*M2M, error) {
+	ctx := context.Background()
+	a, err := authentication.New(ctx, auth0Domain, authentication.WithClientID(auth0ClientID), authentication.WithClientSecret(auth0ClientSecret))
+	if err != nil {
+		return &M2M{}, fmt.Errorf("cannot connect to auth0 Management API: %w", err)
+	}
+
+	return &M2M{
+		domain:       auth0Domain,
+		clientID:     auth0ClientID,
+		clientSecret: auth0ClientSecret,
+		auth:         a,
+		mu:           new(sync.RWMutex),
+		token:        Token{},
+	}, nil
+}
+
+func (g *M2M) GetToken() (Token, error) {
+	if g.token.IsExpired() {
+		token, err := g.fetchToken()
+		if err != nil {
+			return Token{}, errors.New("trouble fetching new token from auth0")
+		}
+
+		g.mu.Lock()
+		g.token = token
+		g.mu.Unlock()
+	}
+
+	// Read token from the m2m struct
+	var foundToken Token
+	g.mu.RLock()
+	foundToken = g.token
+	g.mu.RUnlock()
+
+	return foundToken, nil
+}
+
+func (g *M2M) fetchToken() (Token, error) {
+	reqBody := tokenRequestBody{
+		ClientID:     g.clientID,
+		ClientSecret: g.clientSecret,
+		Audience:     audience,
+		GrantType:    clientCredentials,
+	}
+
+	req, err := g.auth.NewRequest(context.Background(), http.MethodPost, fmt.Sprintf("%s/oauth/token", g.domain), reqBody)
+	if err != nil {
+		return Token{}, err
+	}
+
+	res, err := g.auth.Do(req)
+	if err != nil {
+		return Token{}, err
+	}
+	defer res.Body.Close()
+
+	var tokenResp tokenResponseBody
+	if err := json.NewDecoder(res.Body).Decode(&tokenResp); err != nil {
+		return Token{}, err
+	}
+
+	token := Token{
+		accessToken: tokenResp.AccessToken,
+		tokenType:   tokenResp.TokenType,
+		expiresIn:   time.Unix(tokenResp.ExpiresIn, 0),
+	}
+
+	return token, nil
+}