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form3.go
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form3.go
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package form3
import (
"crypto/x509"
"encoding/pem"
"errors"
"fmt"
"net/http"
"net/url"
"os"
genClient "github.com/form3tech-oss/go-form3/v6/pkg/generated/client"
rc "github.com/go-openapi/runtime/client"
"github.com/go-openapi/strfmt"
"github.com/google/uuid"
)
const (
ReqMimeType = "application/vnd.api+json"
UserAgent = "go-form3-client"
)
var ErrPEMDecode = errors.New("failed to decode PEM block containing private key")
type ErrMissingEnvVariable struct {
env string
}
func (e *ErrMissingEnvVariable) Error() string {
return fmt.Sprintf("missing environment variable %s", e.env)
}
type F3 struct {
genClient.Form3PublicAPI
defaults *ClientDefaults
orgID uuid.UUID
baseURL url.URL
httpClient *http.Client
}
type Option func(*F3)
func New(opts ...Option) (*F3, error) {
b, err := url.Parse(fmt.Sprintf("https://%s", genClient.DefaultHost))
if err != nil {
return nil, fmt.Errorf("could not parse URL: %w", err)
}
dt := http.DefaultTransport.(*http.Transport).Clone()
c := &http.Client{
Transport: dt,
}
f3 := &F3{
defaults: nil,
httpClient: c,
baseURL: *b,
}
for _, o := range opts {
o(f3)
}
rt := rc.NewWithClient(f3.baseURL.Host, "/v1", []string{f3.baseURL.Scheme}, f3.httpClient)
defaults := NewClientDefaults()
orgUUID := strfmt.UUID(f3.orgID.String())
defaults.OrganisationID = &orgUUID
pubClient := genClient.New(rt, strfmt.Default, defaults)
f3.Form3PublicAPI = *pubClient
return f3, nil
}
func WithHTTPClient(c *http.Client) Option {
return func(f3 *F3) {
f3.httpClient = c
}
}
func WithBaseURL(u url.URL) Option {
return func(f3 *F3) {
f3.baseURL = u
}
}
func WithOrganisationID(u uuid.UUID) Option {
return func(f3 *F3) {
f3.orgID = u
}
}
func WithRequestSigningTransport(opts ...RequestSigningOption) Option {
return func(f3 *F3) {
f3.httpClient.Transport = NewRequestSigningTransport(opts...)
}
}
func WithTokenTransport(opts ...TokenOption) Option {
return func(f3 *F3) {
f3.httpClient.Transport = NewTokenTransport(opts...)
}
}
func NewFromEnv() (*F3, error) {
privKeyInPEM, err := getEnv("FORM3_PRIVATE_KEY")
if err != nil {
return nil, err
}
block, _ := pem.Decode([]byte(privKeyInPEM))
if block == nil || block.Type != "RSA PRIVATE KEY" {
return nil, ErrPEMDecode
}
privateKey, err := x509.ParsePKCS1PrivateKey(block.Bytes)
if err != nil {
return nil, fmt.Errorf("could not parse private key: %w", err)
}
publicKeyID, err := getEnv("FORM3_PUBLIC_KEY_ID")
if err != nil {
return nil, err
}
p, err := uuid.Parse(publicKeyID)
if err != nil {
return nil, fmt.Errorf("could not parse public key ID: %w", err)
}
opts := []Option{WithRequestSigningTransport(WithPublicKeyID(p), WithPrivateKey(privateKey))}
host, err := getEnv("FORM3_HOST")
if err != nil {
return nil, err
}
baseURL, err := url.Parse(host)
if err != nil {
return nil, fmt.Errorf("failed to parse the base URL: %w", err)
}
opts = append(opts, WithBaseURL(*baseURL))
organisationID, err := getEnv("FORM3_ORGANISATION_ID")
if err != nil {
return nil, err
}
u, err := uuid.Parse(organisationID)
if err != nil {
return nil, fmt.Errorf("could not parse UUID: %w", err)
}
return New(append(opts, WithOrganisationID(u))...)
}
func getEnv(name string) (string, error) {
env, ok := os.LookupEnv(name)
if !ok {
return "", &ErrMissingEnvVariable{env: name}
}
return env, nil
}