M3O SDK Concept

examples/otp/handler/handler.go

@@ -0,0 +1,99 @@
+package handler
+
+import (
+	"crypto/rand"
+
+	otp "github.com/m3o/m3o-go/examples/otp/proto"
+	"github.com/m3o/m3o-go/context"
+	"github.com/m3o/m3o-go/errors"
+	"github.com/m3o/m3o-go/sms"
+	"github.com/m3o/m3o-go/store/keyvalue"
+)
+
+const (
+	otpChars  = "1234567890"
+	otpLength = 6
+	otpTTL = time.Minute * 5
+)
+
+var (
+	errMissingPhoneNumber = errors.BadRequest("Missing PhoneNumber")
+	errMissingCode 				= errors.BadRequest("Missing Code")
+	errInvalidCode 				= errors.BadRequest("Invalid Code")
+)
+
+// OTP satisfies the OTP handler interface. Note: this handler is an exampple and not intended for 
+// production use - the handler does not enforce verification limits so it would be possible to brute
+// force the verification process. It is advised to use a retry limit of 3 in real-world applications.
+type OTP struct {
+	SMS   sms.Service
+	Store keyvalue.Store
+}
+
+// Send a one time password to the phone number provided
+func (o *OTP) Send(ctx context.Context, req *otp.SendRequest) (*otp.SendResponse, error) {
+	// validate the request
+	if len(req.PhoneNumber) == 0 {
+		return nil, errMissingPhoneNumber
+	}
+
+	// generate and send the OPT
+	otp := generateOTP()
+	msg := fmt.Sprintf("Your M3O verification code is %v", otp
+	if err := o.SMS.Send(req.PhoneNumber, msg); err != nil {
+		return nil, err
+	}
+
+	// write the code to the store
+	err := o.Store.Write(req.PhoneNumber, otp, keyvalue.WriteOptions{
+		Expiry: time.Now().Add(otpTTL),
+	})
+	if err != nil {
+		return nil, errors.InternalServerError("Error writing OTP to the store")
+	}
+
+	// return no error, indicating the verification code send successfully
+	return &otp.SendResponse{}, nil
+}
+
+// Validate a one time password
+func (o *OTP) Verify(ctx context.Context, req *otp.VerifyRequest) (*otp.VerifyResponse, error) {
+	// validate the request
+	if len(req.PhoneNumber) == 0 {
+		return nil, errMissingPhoneNumber
+	}
+	if len(req.Code) == 0 {
+		return nil, errMissingCode
+	}
+
+	// lookup the phone number from the store
+	rec, err := o.Store.Read(req.PhoneNumber)
+	if err == keyvalue.ErrRecordNotFound {
+		return nil, errMissingCode
+	} else if err != nil {
+		return nil, errors.InternalServerError("Error reading OTP from the store")
+	}
+
+	// ensure the codes match
+	if rec.Value != req.Code {
+		return nil, errInvalidCode
+	}
+
+	// return no error, indicating the verification was successful
+	return &otp.VerifyResponse{}, nil
+}
+
+func generateOTP() (string, error) {
+	buffer := make([]byte, otpLength)
+	_, err := rand.Read(buffer)
+	if err != nil {
+		return "", err
+	}
+
+	otpCharsLength := len(otpChars)
+	for i := 0; i < otpLength; i++ {
+		buffer[i] = otpChars[int(buffer[i])%otpCharsLength]
+	}
+
+	return string(buffer), nil
+}

examples/otp/handler/handler_test.go

@@ -0,0 +1,23 @@
+package handler
+
+import (
+	"testing"
+
+	"github.com/m3o/m3o-go/sms"
+	"github.com/m3o/m3o-go/store/keyvalue"
+)
+
+func TestHandler(t *testing.T) {
+	h := OTP{
+		SMS:   sms.NewMock(),
+		Store: keyvalue.NewMock(),
+	}
+
+	t.Run("Send", func(t *testing.T) {
+
+	})
+
+	t.Run("Verify", func(t *testing.T) {
+
+	})
+}

examples/otp/main.go

@@ -0,0 +1,19 @@
+package otp
+
+import (
+	"github.com/m3o/m3o-go/examples/otp/handler"
+	"github.com/m3o/m3o-go/server"
+	"github.com/m3o/m3o-go/sms"
+	"github.com/m3o/m3o-go/store/keyvalue"
+)
+
+func main() {
+	// register the handler
+	server.RegisterHandler(handler.OTP{
+		SMS:   sms.NewClient(),
+		Store: keyvalue.NewClient(),
+	})
+
+	// run the server
+	server.Run()
+}

examples/otp/proto/otp.pb.go

@@ -0,0 +1,339 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.23.0
+// 	protoc        v3.13.0
+// source: otp/proto/otp.proto
+
+package otp
+
+import (
+	proto "github.com/golang/protobuf/proto"
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+// This is a compile-time assertion that a sufficiently up-to-date version
+// of the legacy proto package is being used.
+const _ = proto.ProtoPackageIsVersion4
+
+type SendRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	PhoneNumber string `protobuf:"bytes,1,opt,name=phone_number,json=phoneNumber,proto3" json:"phone_number,omitempty"`
+}
+
+func (x *SendRequest) Reset() {
+	*x = SendRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_otp_proto_otp_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SendRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SendRequest) ProtoMessage() {}
+
+func (x *SendRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_otp_proto_otp_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SendRequest.ProtoReflect.Descriptor instead.
+func (*SendRequest) Descriptor() ([]byte, []int) {
+	return file_otp_proto_otp_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *SendRequest) GetPhoneNumber() string {
+	if x != nil {
+		return x.PhoneNumber
+	}
+	return ""
+}
+
+type SendResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *SendResponse) Reset() {
+	*x = SendResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_otp_proto_otp_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SendResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SendResponse) ProtoMessage() {}
+
+func (x *SendResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_otp_proto_otp_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SendResponse.ProtoReflect.Descriptor instead.
+func (*SendResponse) Descriptor() ([]byte, []int) {
+	return file_otp_proto_otp_proto_rawDescGZIP(), []int{1}
+}
+
+type VerifyRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	PhoneNumber string `protobuf:"bytes,1,opt,name=phone_number,json=phoneNumber,proto3" json:"phone_number,omitempty"`
+	Code        string `protobuf:"bytes,2,opt,name=code,proto3" json:"code,omitempty"`
+}
+
+func (x *VerifyRequest) Reset() {
+	*x = VerifyRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_otp_proto_otp_proto_msgTypes[2]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *VerifyRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*VerifyRequest) ProtoMessage() {}
+
+func (x *VerifyRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_otp_proto_otp_proto_msgTypes[2]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use VerifyRequest.ProtoReflect.Descriptor instead.
+func (*VerifyRequest) Descriptor() ([]byte, []int) {
+	return file_otp_proto_otp_proto_rawDescGZIP(), []int{2}
+}
+
+func (x *VerifyRequest) GetPhoneNumber() string {
+	if x != nil {
+		return x.PhoneNumber
+	}
+	return ""
+}
+
+func (x *VerifyRequest) GetCode() string {
+	if x != nil {
+		return x.Code
+	}
+	return ""
+}
+
+type VerifyResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *VerifyResponse) Reset() {
+	*x = VerifyResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_otp_proto_otp_proto_msgTypes[3]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *VerifyResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*VerifyResponse) ProtoMessage() {}
+
+func (x *VerifyResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_otp_proto_otp_proto_msgTypes[3]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use VerifyResponse.ProtoReflect.Descriptor instead.
+func (*VerifyResponse) Descriptor() ([]byte, []int) {
+	return file_otp_proto_otp_proto_rawDescGZIP(), []int{3}
+}
+
+var File_otp_proto_otp_proto protoreflect.FileDescriptor
+
+var file_otp_proto_otp_proto_rawDesc = []byte{
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+}
+
+var (
+	file_otp_proto_otp_proto_rawDescOnce sync.Once
+	file_otp_proto_otp_proto_rawDescData = file_otp_proto_otp_proto_rawDesc
+)
+
+func file_otp_proto_otp_proto_rawDescGZIP() []byte {
+	file_otp_proto_otp_proto_rawDescOnce.Do(func() {
+		file_otp_proto_otp_proto_rawDescData = protoimpl.X.CompressGZIP(file_otp_proto_otp_proto_rawDescData)
+	})
+	return file_otp_proto_otp_proto_rawDescData
+}
+
+var file_otp_proto_otp_proto_msgTypes = make([]protoimpl.MessageInfo, 4)
+var file_otp_proto_otp_proto_goTypes = []interface{}{
+	(*SendRequest)(nil),    // 0: example.otp.SendRequest
+	(*SendResponse)(nil),   // 1: example.otp.SendResponse
+	(*VerifyRequest)(nil),  // 2: example.otp.VerifyRequest
+	(*VerifyResponse)(nil), // 3: example.otp.VerifyResponse
+}
+var file_otp_proto_otp_proto_depIdxs = []int32{
+	0, // 0: example.otp.OTP.Send:input_type -> example.otp.SendRequest
+	2, // 1: example.otp.OTP.Verify:input_type -> example.otp.VerifyRequest
+	1, // 2: example.otp.OTP.Send:output_type -> example.otp.SendResponse
+	3, // 3: example.otp.OTP.Verify:output_type -> example.otp.VerifyResponse
+	2, // [2:4] is the sub-list for method output_type
+	0, // [0:2] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_otp_proto_otp_proto_init() }
+func file_otp_proto_otp_proto_init() {
+	if File_otp_proto_otp_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_otp_proto_otp_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*SendRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_otp_proto_otp_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*SendResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_otp_proto_otp_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*VerifyRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_otp_proto_otp_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*VerifyResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_otp_proto_otp_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   4,
+			NumExtensions: 0,
+			NumServices:   1,
+		},
+		GoTypes:           file_otp_proto_otp_proto_goTypes,
+		DependencyIndexes: file_otp_proto_otp_proto_depIdxs,
+		MessageInfos:      file_otp_proto_otp_proto_msgTypes,
+	}.Build()
+	File_otp_proto_otp_proto = out.File
+	file_otp_proto_otp_proto_rawDesc = nil
+	file_otp_proto_otp_proto_goTypes = nil
+	file_otp_proto_otp_proto_depIdxs = nil
+}

examples/otp/proto/otp.pb.m3o.go

@@ -0,0 +1,101 @@
+// Code generated by protoc-gen-micro. DO NOT EDIT.
+// source: otp/proto/otp.proto
+
+package otp
+
+import (
+	fmt "fmt"
+	math "math"
+
+	proto "github.com/golang/protobuf/proto"
+
+	context "context"
+
+	api "github.com/micro/micro/v3/service/api"
+
+	client "github.com/micro/micro/v3/service/client"
+
+	server "github.com/micro/micro/v3/service/server"
+)
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ api.Endpoint
+var _ context.Context
+var _ client.Option
+var _ server.Option
+
+// Api Endpoints for OTP service
+
+func NewOTPEndpoints() []*api.Endpoint {
+	return []*api.Endpoint{}
+}
+
+// Client API for OTP service
+
+type OTPService interface {
+	Send(ctx context.Context, in *SendRequest, opts ...client.CallOption) (*SendResponse, error)
+	Verify(ctx context.Context, in *VerifyRequest, opts ...client.CallOption) (*VerifyResponse, error)
+}
+
+type oTPService struct {
+	c    client.Client
+	name string
+}
+
+func NewOTPClient() OTPService {
+	return &oTPService{}
+}
+
+func NewOTPMock() OTPService {
+	return &oTPService{}
+}
+
+func (c *oTPService) Send(ctx context.Context, in *SendRequest, opts ...client.CallOption) (*SendResponse, error) {
+	req := c.c.NewRequest(c.name, "OTP.Send", in)
+	out := new(SendResponse)
+	err := c.c.Call(ctx, req, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *oTPService) Verify(ctx context.Context, in *VerifyRequest, opts ...client.CallOption) (*VerifyResponse, error) {
+	req := c.c.NewRequest(c.name, "OTP.Verify", in)
+	out := new(VerifyResponse)
+	err := c.c.Call(ctx, req, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// Server API for OTP service
+
+type OTPHandler interface {
+	Send(context.Context, *SendRequest) (*SendResponse, error)
+	Verify(context.Context, *VerifyRequest) (*VerifyResponse, error)
+}
+
+type oTPHandler struct {
+	OTPHandler
+}
+
+func (h *oTPHandler) Send(ctx context.Context, req *SendRequest) (*SendResponse, error) {
+	return h.OTPHandler.Send(ctx, req)
+}
+
+func (h *oTPHandler) Verify(ctx context.Context, req *VerifyRequest) (*VerifyResponse, error) {
+	return h.OTPHandler.Verify(ctx, req)
+}

examples/otp/proto/otp.proto

@@ -0,0 +1,22 @@
+syntax = "proto3";
+
+package example.otp;
+option go_package = "github.com/m3o/m3o-go-examples/otp/proto;otp";
+
+service OTP {
+  rpc Send(SendRequest) returns (SendResponse);
+  rpc Verify(VerifyRequest) returns (VerifyResponse);
+}
+
+message SendRequest {
+  string phone_number = 1;
+}
+
+message SendResponse {}
+
+message VerifyRequest {
+  string phone_number = 1;
+  string code = 2;
+}
+
+message VerifyResponse {}