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oracle_common.go
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oracle_common.go
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package oracle
import (
"crypto/tls"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"os"
"time"
"github.com/fnproject/fn_go/provider/oracle/shim"
"github.com/oracle/oci-go-sdk/v48/functions"
"github.com/fnproject/fn_go/client/version"
"github.com/fnproject/fn_go/clientv2"
"github.com/fnproject/fn_go/provider"
openapi "github.com/go-openapi/runtime/client"
"github.com/go-openapi/strfmt"
"github.com/oracle/oci-go-sdk/v48/common"
)
const (
CfgTenancyID = "oracle.tenancy-id"
CfgProfile = "oracle.profile"
CfgCompartmentID = "oracle.compartment-id"
CfgImageCompartmentID = "oracle.image-compartment-id"
CfgDisableCerts = "oracle.disable-certs"
CompartmentMetadata = "http://169.254.169.254/opc/v1/instance/compartmentId"
FunctionsAPIURLTmpl = "https://functions.%s.oci.%s"
realmDomainMetadata = "http://169.254.169.254/opc/v1/instance/regionInfo/realmDomainComponent"
requestHeaderOpcRequestID = "Opc-Request-Id"
requestHeaderOpcCompId = "opc-compartment-id"
requestHeaderOpcOboToken = "opc-obo-token"
OCI_CLI_PROFILE_ENV_VAR = "OCI_CLI_PROFILE"
OCI_CLI_REGION_ENV_VAR = "OCI_CLI_REGION"
OCI_CLI_TENANCY_ENV_VAR = "OCI_CLI_TENANCY"
OCI_CLI_CONFIG_FILE_ENV_VAR = "OCI_CLI_CONFIG_FILE"
OCI_CLI_DELEGATION_TOKEN_FILE_ENV_VAR = "OCI_CLI_DELEGATION_TOKEN_FILE"
OCI_CLI_USER_ENV_VAR = "OCI_CLI_USER"
OCI_CLI_FINGERPRINT_ENV_VAR = "OCI_CLI_FINGERPRINT"
OCI_CLI_KEY_FILE_ENV_VAR = "OCI_CLI_KEY_FILE"
userAgentPrefixUser = "fn_go-oracle"
userAgentPrefixIp = "fn_go-oracle-ip"
userAgentPrefixCs = "fn_go-oracle-cs"
)
type Response struct {
Annotations Annotations `json:"annotations"`
CreatedAt string `json:"created_at"`
UpdatedAt string `json:"updated_at"`
Name string `json:"name"`
}
type Annotations struct {
CompartmentID string `json:"oracle.com/oci/compartmentId"`
ShortCode string `json:"oracle.com/oci/appCode"`
}
type OracleProvider struct {
// FnApiUrl is the endpoint to use for API interactions
FnApiUrl *url.URL
//Signer performs auth operation
Signer common.HTTPRequestSigner
//A request interceptor can be used to customize the request before signing and dispatching
Interceptor common.RequestInterceptor
// DisableCerts indicates if server certificates should be ignored - TBD
DisableCerts bool
// CompartmentID is the ocid of the functions compartment ID for a given function
CompartmentID string
// ImageCompartmentID is the ocid of the functions compartment ID for a given function
ImageCompartmentID string
// ConfigurationProvider is the OCI configuration provider for signing requests
ConfigurationProvider common.ConfigurationProvider
ociClient functions.FunctionsManagementClient
}
//-- Provider interface impl ----------------------------------------------------------------------------------
type ociSigningRoundTripper struct {
signer common.HTTPRequestSigner
interceptor common.RequestInterceptor
transport http.RoundTripper
compartmentID string
}
func (t ociSigningRoundTripper) RoundTrip(request *http.Request) (response *http.Response, err error) {
if request.Header.Get("Date") == "" {
request.Header.Set("Date", time.Now().UTC().Format(http.TimeFormat))
}
err = t.intercept(request)
if err != nil {
return
}
err = t.signRequest(request)
if err != nil {
return
}
response, err = t.transport.RoundTrip(request)
return
}
// Add the necessary headers and sign the request
func (t ociSigningRoundTripper) signRequest(request *http.Request) (err error) {
// Check that a Date header is set, otherwise authentication will fail
if request.Header.Get("Date") == "" {
return fmt.Errorf("Date header must be present and non-empty on request")
}
if request.Method == "POST" || request.Method == "PATCH" || request.Method == "PUT" {
request.Header.Set("Content-Type", "application/json")
request.Header.Set("Content-Length", fmt.Sprintf("%d", request.ContentLength))
}
err = t.signer.Sign(request)
return err
}
// Add headers and call interceptor
func (t ociSigningRoundTripper) intercept(request *http.Request) (err error) {
// set Opc-Request-Id header
requestID := provider.GetRequestID(request.Context())
if requestID != "" {
request.Header.Set(requestHeaderOpcRequestID, requestID)
}
// set opc-compartment-id
request.Header.Set(requestHeaderOpcCompId, t.compartmentID)
// call interceptor
if t.interceptor != nil {
err = t.interceptor(request)
}
return
}
// Skip verification of insecure certs
func InsecureRoundTripper(roundTripper http.RoundTripper) http.RoundTripper {
if roundTripper == nil {
roundTripper = http.DefaultTransport
}
if transport, ok := roundTripper.(*http.Transport); ok {
if transport.TLSClientConfig != nil {
transport.TLSClientConfig.InsecureSkipVerify = true
} else {
transport.TLSClientConfig = &tls.Config{InsecureSkipVerify: true}
}
return transport
}
return nil
}
//-- Provider interface impl ----------------------------------------------------------------------------------
func (op *OracleProvider) APIClientv2() *clientv2.Fn {
return &clientv2.Fn{
Apps: shim.NewAppsShim(op.ociClient, op.CompartmentID),
Fns: shim.NewFnsShim(op.ociClient),
Triggers: shim.NewTriggersShim(),
}
}
func (op *OracleProvider) APIURL() *url.URL {
return op.FnApiUrl
}
func (op *OracleProvider) UnavailableResources() []provider.FnResourceType {
return []provider.FnResourceType{provider.TriggerResourceType}
}
func (op *OracleProvider) VersionClient() *version.Client {
runtime := openapi.New(op.FnApiUrl.Host, op.FnApiUrl.Path, []string{op.FnApiUrl.Scheme})
runtime.Transport = op.WrapCallTransport(runtime.Transport)
return version.New(runtime, strfmt.Default)
}
func (op *OracleProvider) WrapCallTransport(roundTripper http.RoundTripper) http.RoundTripper {
if op.DisableCerts {
roundTripper = InsecureRoundTripper(roundTripper)
}
signingRoundTripper := ociSigningRoundTripper{
transport: roundTripper,
signer: op.Signer,
interceptor: op.Interceptor,
compartmentID: op.CompartmentID,
}
return signingRoundTripper
}
func getEnv(key, fallback string) string {
value := os.Getenv(key)
if value == "" {
value = fallback
}
return value
}
// Retrieve second-level domain for the current realm from IMDS
func GetRealmDomain() (string, error) {
client := &http.Client{
Timeout: time.Second * 10,
}
resp, err := client.Get(realmDomainMetadata)
if err != nil {
return "", fmt.Errorf("problem fetching realm domain from metadata endpoint %s", err)
}
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", fmt.Errorf("problem reading body when fetching realm domain from metadata endpoint %s", err)
}
return string(body), nil
}