Spam service (#269)

gifs/main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"github.com/micro/services/gifs/handler"
 	pb "github.com/micro/services/gifs/proto"
+	"github.com/micro/services/pkg/tracing"
 
 	"github.com/micro/micro/v3/service"
 	"github.com/micro/micro/v3/service/logger"
@@ -17,6 +18,8 @@ func main() {
 
 	// Register handler
 	pb.RegisterGifsHandler(srv.Server(), handler.New())
+	traceCloser := tracing.SetupOpentracing("gifs")
+	defer traceCloser.Close()
 
 	// Run service
 	if err := srv.Run(); err != nil {

go.mod

@@ -6,6 +6,7 @@ require (
 	github.com/Masterminds/semver/v3 v3.1.1
 	github.com/PuerkitoBio/goquery v1.6.1
 	github.com/SlyMarbo/rss v1.0.1
+	github.com/Teamwork/spamc v0.0.0-20200109085853-a4e0c5c3f7a0
 	github.com/asim/mq v0.1.0
 	github.com/cdipaolo/goml v0.0.0-20190412180403-e1f51f713598 // indirect
 	github.com/cdipaolo/sentiment v0.0.0-20200617002423-c697f64e7f10
@@ -33,7 +34,7 @@ require (
 	github.com/mattheath/base62 v0.0.0-20150408093626-b80cdc656a7a // indirect
 	github.com/mattheath/kala v0.0.0-20171219141654-d6276794bf0e
 	github.com/micro/micro-go v0.0.0-20211101221015-79ab982f8163
-	github.com/micro/micro/v3 v3.6.1-0.20211110104311-614fde05be0c
+	github.com/micro/micro/v3 v3.7.1-0.20211111170433-1ebb8328e280
 	github.com/miekg/dns v1.1.31 // indirect
 	github.com/oschwald/geoip2-golang v1.5.0
 	github.com/patrickmn/go-cache v2.1.0+incompatible
@@ -45,6 +46,8 @@ require (
 	github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e
 	github.com/stoewer/go-strcase v1.2.0
 	github.com/stretchr/testify v1.7.0
+	github.com/teamwork/test v0.0.0-20200108114543-02621bae84ad // indirect
+	github.com/teamwork/utils v0.0.0-20211103135549-f7e7a68ba696 // indirect
 	github.com/teris-io/shortid v0.0.0-20171029131806-771a37caa5cf
 	github.com/tkuchiki/go-timezone v0.2.2
 	github.com/ttacon/builder v0.0.0-20170518171403-c099f663e1c2 // indirect

go.sum

@@ -72,6 +72,10 @@ github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWX
 github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI=
 github.com/SlyMarbo/rss v1.0.1 h1:fiaIU5UhcXauVOniHOIocWG7uj8Ej6pHNarMGPJilzA=
 github.com/SlyMarbo/rss v1.0.1/go.mod h1:JNF+T33oj4m5WLCQXpBTCgO+SxRbYVgdiiimHNgzcbA=
+github.com/Strum355/go-difflib v1.1.0 h1:+rR2X3UuvIbe1Jmhx8WA7gkgjMNRscFWbHchk2RB8I4=
+github.com/Strum355/go-difflib v1.1.0/go.mod h1:r1cVg1JkGsTWkaR7At56v7hfuMgiUL8meTLwxFzOmvE=
+github.com/Teamwork/spamc v0.0.0-20200109085853-a4e0c5c3f7a0 h1:OH7eTFVtLj/DJYM2EgWZE+GIq1T5xg/m+JiKH9tV9pc=
+github.com/Teamwork/spamc v0.0.0-20200109085853-a4e0c5c3f7a0/go.mod h1:q7zbrHu00GwyX+EVlv0bAfmzlbhI0tRpznyCZ96VyN4=
 github.com/ajstarks/svgo v0.0.0-20180226025133-644b8db467af/go.mod h1:K08gAheRH3/J6wwsYMMT4xOr94bZjxIelGM0+d/wbFw=
 github.com/akamai/AkamaiOPEN-edgegrid-golang v0.9.0/go.mod h1:zpDJeKyp9ScW4NNrbdr+Eyxvry3ilGPewKoXw3XGN1k=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
@@ -499,6 +503,14 @@ github.com/micro/micro-go v0.0.0-20211101221015-79ab982f8163 h1:kNngAyoUre7ahqYW
 github.com/micro/micro-go v0.0.0-20211101221015-79ab982f8163/go.mod h1:o4fTExNn5LlnQRB/WiW3RChsohPwQTJ1AKdNCz2YEYA=
 github.com/micro/micro/v3 v3.6.1-0.20211110104311-614fde05be0c h1:9+w31dXDHVUD11x1St5LiXiBQLNSUxgeH9GI9+sKv0M=
 github.com/micro/micro/v3 v3.6.1-0.20211110104311-614fde05be0c/go.mod h1:NqYnFOGrnc0Apk912w49oX9qIk1YDJcCaO+y+CLaAXA=
+github.com/micro/micro/v3 v3.7.1-0.20211111155628-5c83aaf82619 h1:SRfAA7YcpHh1P/F1HY8p7QprED5o6WOlovGZoZcuHxU=
+github.com/micro/micro/v3 v3.7.1-0.20211111155628-5c83aaf82619/go.mod h1:NqYnFOGrnc0Apk912w49oX9qIk1YDJcCaO+y+CLaAXA=
+github.com/micro/micro/v3 v3.7.1-0.20211111162246-1f3d81ada4a9 h1:1jn/GQhmv87dxGaoOOWou+LfJWc+McSFlg+8GQ78Xf0=
+github.com/micro/micro/v3 v3.7.1-0.20211111162246-1f3d81ada4a9/go.mod h1:NqYnFOGrnc0Apk912w49oX9qIk1YDJcCaO+y+CLaAXA=
+github.com/micro/micro/v3 v3.7.1-0.20211111164609-a157fe0c3185 h1:7CjYMqI5ACQAL276dJGoleoHeZRIkLmMM0a9rSio8Kk=
+github.com/micro/micro/v3 v3.7.1-0.20211111164609-a157fe0c3185/go.mod h1:NqYnFOGrnc0Apk912w49oX9qIk1YDJcCaO+y+CLaAXA=
+github.com/micro/micro/v3 v3.7.1-0.20211111170433-1ebb8328e280 h1:SOthdbPABgdxgsi9d7lXBDE8WzlTvj+2owHR51vW2AA=
+github.com/micro/micro/v3 v3.7.1-0.20211111170433-1ebb8328e280/go.mod h1:NqYnFOGrnc0Apk912w49oX9qIk1YDJcCaO+y+CLaAXA=
 github.com/miekg/dns v1.1.15/go.mod h1:W1PPwlIAgtquWBMBEV9nkV9Cazfe8ScdGz/Lj7v3Nrg=
 github.com/miekg/dns v1.1.27/go.mod h1:KNUDUusw/aVsxyTYZM1oqvCicbwhgbNgztCETuNZ7xM=
 github.com/miekg/dns v1.1.31 h1:sJFOl9BgwbYAWOGEwr61FU28pqsBNdpRBnhGXtO06Oo=
@@ -637,6 +649,11 @@ github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/teamwork/test v0.0.0-20190410143529-8897d82f8d46/go.mod h1:TIbx7tx6WHBjQeLRM4eWQZBL7kmBZ7/KI4x4v7Y5YmA=
+github.com/teamwork/test v0.0.0-20200108114543-02621bae84ad h1:25sEr0awm0ZPancg5W5H5VvN7PWsJloUBpii10a9isw=
+github.com/teamwork/test v0.0.0-20200108114543-02621bae84ad/go.mod h1:TIbx7tx6WHBjQeLRM4eWQZBL7kmBZ7/KI4x4v7Y5YmA=
+github.com/teamwork/utils v0.0.0-20211103135549-f7e7a68ba696 h1:G6Hc6/KxUmHxZsCgkXOyxp6UzBrkSA/zQjZWNBWzL3A=
+github.com/teamwork/utils v0.0.0-20211103135549-f7e7a68ba696/go.mod h1:3Fn0qxFeRNpvsg/9T1+btOOOKkd1qG2nPYKKcOmNpcs=
 github.com/teris-io/shortid v0.0.0-20171029131806-771a37caa5cf h1:Z2X3Os7oRzpdJ75iPqWZc0HeJWFYNCvKsfpQwFpRNTA=
 github.com/teris-io/shortid v0.0.0-20171029131806-771a37caa5cf/go.mod h1:M8agBzgqHIhgj7wEn9/0hJUZcrvt9VY+Ln+S1I5Mha0=
 github.com/tidwall/pretty v1.0.0 h1:HsD+QiTn7sK6flMKIvNmpqz1qrpP3Ps6jOKIKMooyg4=

qr/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"github.com/micro/services/pkg/tracing"
 	"github.com/micro/services/qr/handler"
 	pb "github.com/micro/services/qr/proto"
 
@@ -17,6 +18,8 @@ func main() {
 
 	// Register handler
 	pb.RegisterQrHandler(srv.Server(), handler.New())
+	traceCloser := tracing.SetupOpentracing("qr")
+	defer traceCloser.Close()
 
 	// Run service
 	if err := srv.Run(); err != nil {

spam/.gitignore

@@ -0,0 +1,2 @@
+
+spam

spam/Dockerfile

@@ -0,0 +1,3 @@
+FROM alpine
+ADD spam /spam
+ENTRYPOINT [ "/spam" ]

spam/Makefile

@@ -0,0 +1,28 @@
+
+GOPATH:=$(shell go env GOPATH)
+.PHONY: init
+init:
+	go get -u github.com/golang/protobuf/proto
+	go get -u github.com/golang/protobuf/protoc-gen-go
+	go get github.com/micro/micro/v3/cmd/protoc-gen-micro
+	go get github.com/micro/micro/v3/cmd/protoc-gen-openapi
+
+.PHONY: api
+api:
+	protoc --openapi_out=. --proto_path=. proto/spam.proto
+
+.PHONY: proto
+proto:
+	protoc --proto_path=. --micro_out=. --go_out=:. proto/spam.proto
+	
+.PHONY: build
+build:
+	go build -o spam *.go
+
+.PHONY: test
+test:
+	go test -v ./... -cover
+
+.PHONY: docker
+docker:
+	docker build . -t spam:latest

spam/README.md

@@ -0,0 +1,7 @@
+Check if an email is spam
+
+# Spam Service
+
+An API to classify emails against spam detection rules. 
+
+Powered by [SpamAssassin](http://spamassassin.apache.org/).

spam/examples.json

@@ -0,0 +1,23 @@
+{
+  "classify": [
+    {
+      "title": "Classify an email",
+      "run_check": true,
+      "request": {
+        "subject": "Welcome",
+        "email_body": "Hi there,\n\nWelcome to M3O.\n\nThanks\nM3O team",
+        "from": "noreply@m3o.com",
+        "to": "hello@example.com"
+      },
+      "response": {
+        "is_spam": false,
+        "score": 0.1,
+        "details": [
+          "NO_RELAYS, Informational: message was not relayed via SMTP, -0",
+          "NO_RECEIVED, Informational: message has no Received headers, -0",
+          "MISSING_MID, Missing Message-Id: header, 0.1"
+        ]
+      }
+    }
+  ]
+}

spam/generate.go

@@ -0,0 +1,2 @@
+package main
+//go:generate make proto

spam/handler/spam.go

@@ -0,0 +1,75 @@
+package handler
+
+import (
+	"bufio"
+	"bytes"
+	"context"
+	"fmt"
+	"net/textproto"
+	"time"
+
+	"github.com/Teamwork/spamc"
+	"github.com/micro/micro/v3/service/config"
+	"github.com/micro/micro/v3/service/errors"
+	log "github.com/micro/micro/v3/service/logger"
+	spam "github.com/micro/services/spam/proto"
+)
+
+type conf struct {
+	SpamdAddress string `json:"spamd_address"`
+}
+
+type Spam struct {
+	c      conf
+	client *spamc.Client
+}
+
+func New() *Spam {
+	val, err := config.Get("micro.spam")
+	if err != nil {
+		log.Fatalf("Failed to load config")
+	}
+	c := conf{}
+	if err := val.Scan(&c); err != nil {
+		log.Fatalf("Failed to load config")
+	}
+	return &Spam{
+		c:      c,
+		client: spamc.New(c.SpamdAddress, nil),
+	}
+}
+
+func (s *Spam) Classify(ctx context.Context, request *spam.ClassifyRequest, response *spam.ClassifyResponse) error {
+	if len(request.EmailBody) == 0 {
+		return errors.BadRequest("spam.Classify", "missing email_body")
+	}
+
+	bf := bytes.NewBufferString("")
+	tp := textproto.NewWriter(bufio.NewWriter(bf))
+
+	if len(request.To) > 0 {
+		tp.PrintfLine("To: %v", request.To)
+	}
+	if len(request.From) > 0 {
+		tp.PrintfLine("From: %v", request.From)
+	}
+	if len(request.Subject) > 0 {
+		tp.PrintfLine("Subject: %v", request.Subject)
+	}
+	tp.PrintfLine("Date: %s", time.Now().Format(time.RFC1123Z))
+	tp.PrintfLine("")
+	tp.PrintfLine("%v", request.EmailBody)
+	rc, err := s.client.Report(ctx, bf, spamc.Header{}.Set("Content-Length", fmt.Sprintf("%d", bf.Len())))
+	if err != nil {
+		log.Errorf("Error checking spamd %s", err)
+		return errors.InternalServerError("spam.Classify", "Error classifying email")
+	}
+	response.IsSpam = rc.IsSpam
+	response.Score = rc.Score
+
+	response.Details = []string{}
+	for _, v := range rc.Report.Table {
+		response.Details = append(response.Details, fmt.Sprintf("%s, %s, %v", v.Rule, v.Description, v.Points))
+	}
+	return nil
+}

spam/main.go

@@ -0,0 +1,29 @@
+package main
+
+import (
+	"github.com/micro/services/pkg/tracing"
+	"github.com/micro/services/spam/handler"
+	pb "github.com/micro/services/spam/proto"
+
+	"github.com/micro/micro/v3/service"
+	"github.com/micro/micro/v3/service/logger"
+)
+
+func main() {
+	// Create service
+	srv := service.New(
+		service.Name("spam"),
+		service.Version("latest"),
+	)
+
+	// Register handler
+	pb.RegisterSpamHandler(srv.Server(), handler.New())
+
+	traceCloser := tracing.SetupOpentracing("spam")
+	defer traceCloser.Close()
+
+	// Run service
+	if err := srv.Run(); err != nil {
+		logger.Fatal(err)
+	}
+}

spam/micro.mu

@@ -0,0 +1 @@
+service spam

spam/proto/spam.pb.go

@@ -0,0 +1,267 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.26.0
+// 	protoc        v3.15.5
+// source: proto/spam.proto
+
+package spam
+
+import (
+	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)
+)
+
+// Check whether an email is likely to be spam based on its attributes
+type ClassifyRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The body of the email
+	EmailBody string `protobuf:"bytes,1,opt,name=email_body,json=emailBody,proto3" json:"email_body,omitempty"`
+	// The email address it is being sent to
+	To string `protobuf:"bytes,2,opt,name=to,proto3" json:"to,omitempty"`
+	// The email address it has been sent from
+	From string `protobuf:"bytes,3,opt,name=from,proto3" json:"from,omitempty"`
+	// The subject of the email
+	Subject string `protobuf:"bytes,4,opt,name=subject,proto3" json:"subject,omitempty"`
+}
+
+func (x *ClassifyRequest) Reset() {
+	*x = ClassifyRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_proto_spam_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ClassifyRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ClassifyRequest) ProtoMessage() {}
+
+func (x *ClassifyRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_proto_spam_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 ClassifyRequest.ProtoReflect.Descriptor instead.
+func (*ClassifyRequest) Descriptor() ([]byte, []int) {
+	return file_proto_spam_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *ClassifyRequest) GetEmailBody() string {
+	if x != nil {
+		return x.EmailBody
+	}
+	return ""
+}
+
+func (x *ClassifyRequest) GetTo() string {
+	if x != nil {
+		return x.To
+	}
+	return ""
+}
+
+func (x *ClassifyRequest) GetFrom() string {
+	if x != nil {
+		return x.From
+	}
+	return ""
+}
+
+func (x *ClassifyRequest) GetSubject() string {
+	if x != nil {
+		return x.Subject
+	}
+	return ""
+}
+
+type ClassifyResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Is it spam? Returns true if its score is > 5
+	IsSpam bool `protobuf:"varint,1,opt,name=is_spam,json=isSpam,proto3" json:"is_spam,omitempty"`
+	// The score evaluated for this email. A higher number means it is more likely to be spam
+	Score float64 `protobuf:"fixed64,2,opt,name=score,proto3" json:"score,omitempty"`
+	// The rules that have contributed to this score
+	Details []string `protobuf:"bytes,3,rep,name=details,proto3" json:"details,omitempty"`
+}
+
+func (x *ClassifyResponse) Reset() {
+	*x = ClassifyResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_proto_spam_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ClassifyResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ClassifyResponse) ProtoMessage() {}
+
+func (x *ClassifyResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_proto_spam_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 ClassifyResponse.ProtoReflect.Descriptor instead.
+func (*ClassifyResponse) Descriptor() ([]byte, []int) {
+	return file_proto_spam_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *ClassifyResponse) GetIsSpam() bool {
+	if x != nil {
+		return x.IsSpam
+	}
+	return false
+}
+
+func (x *ClassifyResponse) GetScore() float64 {
+	if x != nil {
+		return x.Score
+	}
+	return 0
+}
+
+func (x *ClassifyResponse) GetDetails() []string {
+	if x != nil {
+		return x.Details
+	}
+	return nil
+}
+
+var File_proto_spam_proto protoreflect.FileDescriptor
+
+var file_proto_spam_proto_rawDesc = []byte{
+	0x0a, 0x10, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2f, 0x73, 0x70, 0x61, 0x6d, 0x2e, 0x70, 0x72, 0x6f,
+	0x74, 0x6f, 0x12, 0x04, 0x73, 0x70, 0x61, 0x6d, 0x22, 0x6e, 0x0a, 0x0f, 0x43, 0x6c, 0x61, 0x73,
+	0x73, 0x69, 0x66, 0x79, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x1d, 0x0a, 0x0a, 0x65,
+	0x6d, 0x61, 0x69, 0x6c, 0x5f, 0x62, 0x6f, 0x64, 0x79, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52,
+	0x09, 0x65, 0x6d, 0x61, 0x69, 0x6c, 0x42, 0x6f, 0x64, 0x79, 0x12, 0x0e, 0x0a, 0x02, 0x74, 0x6f,
+	0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x02, 0x74, 0x6f, 0x12, 0x12, 0x0a, 0x04, 0x66, 0x72,
+	0x6f, 0x6d, 0x18, 0x03, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x66, 0x72, 0x6f, 0x6d, 0x12, 0x18,
+	0x0a, 0x07, 0x73, 0x75, 0x62, 0x6a, 0x65, 0x63, 0x74, 0x18, 0x04, 0x20, 0x01, 0x28, 0x09, 0x52,
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+	0x08, 0x43, 0x6c, 0x61, 0x73, 0x73, 0x69, 0x66, 0x79, 0x12, 0x15, 0x2e, 0x73, 0x70, 0x61, 0x6d,
+	0x2e, 0x43, 0x6c, 0x61, 0x73, 0x73, 0x69, 0x66, 0x79, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74,
+	0x1a, 0x16, 0x2e, 0x73, 0x70, 0x61, 0x6d, 0x2e, 0x43, 0x6c, 0x61, 0x73, 0x73, 0x69, 0x66, 0x79,
+	0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x22, 0x00, 0x42, 0x0e, 0x5a, 0x0c, 0x2e, 0x2f,
+	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x3b, 0x73, 0x70, 0x61, 0x6d, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74,
+	0x6f, 0x33,
+}
+
+var (
+	file_proto_spam_proto_rawDescOnce sync.Once
+	file_proto_spam_proto_rawDescData = file_proto_spam_proto_rawDesc
+)
+
+func file_proto_spam_proto_rawDescGZIP() []byte {
+	file_proto_spam_proto_rawDescOnce.Do(func() {
+		file_proto_spam_proto_rawDescData = protoimpl.X.CompressGZIP(file_proto_spam_proto_rawDescData)
+	})
+	return file_proto_spam_proto_rawDescData
+}
+
+var file_proto_spam_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
+var file_proto_spam_proto_goTypes = []interface{}{
+	(*ClassifyRequest)(nil),  // 0: spam.ClassifyRequest
+	(*ClassifyResponse)(nil), // 1: spam.ClassifyResponse
+}
+var file_proto_spam_proto_depIdxs = []int32{
+	0, // 0: spam.Spam.Classify:input_type -> spam.ClassifyRequest
+	1, // 1: spam.Spam.Classify:output_type -> spam.ClassifyResponse
+	1, // [1:2] is the sub-list for method output_type
+	0, // [0:1] 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_proto_spam_proto_init() }
+func file_proto_spam_proto_init() {
+	if File_proto_spam_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_proto_spam_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ClassifyRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_proto_spam_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ClassifyResponse); 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_proto_spam_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   2,
+			NumExtensions: 0,
+			NumServices:   1,
+		},
+		GoTypes:           file_proto_spam_proto_goTypes,
+		DependencyIndexes: file_proto_spam_proto_depIdxs,
+		MessageInfos:      file_proto_spam_proto_msgTypes,
+	}.Build()
+	File_proto_spam_proto = out.File
+	file_proto_spam_proto_rawDesc = nil
+	file_proto_spam_proto_goTypes = nil
+	file_proto_spam_proto_depIdxs = nil
+}

spam/proto/spam.pb.micro.go

@@ -0,0 +1,93 @@
+// Code generated by protoc-gen-micro. DO NOT EDIT.
+// source: proto/spam.proto
+
+package spam
+
+import (
+	fmt "fmt"
+	proto "github.com/golang/protobuf/proto"
+	math "math"
+)
+
+import (
+	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 Spam service
+
+func NewSpamEndpoints() []*api.Endpoint {
+	return []*api.Endpoint{}
+}
+
+// Client API for Spam service
+
+type SpamService interface {
+	Classify(ctx context.Context, in *ClassifyRequest, opts ...client.CallOption) (*ClassifyResponse, error)
+}
+
+type spamService struct {
+	c    client.Client
+	name string
+}
+
+func NewSpamService(name string, c client.Client) SpamService {
+	return &spamService{
+		c:    c,
+		name: name,
+	}
+}
+
+func (c *spamService) Classify(ctx context.Context, in *ClassifyRequest, opts ...client.CallOption) (*ClassifyResponse, error) {
+	req := c.c.NewRequest(c.name, "Spam.Classify", in)
+	out := new(ClassifyResponse)
+	err := c.c.Call(ctx, req, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// Server API for Spam service
+
+type SpamHandler interface {
+	Classify(context.Context, *ClassifyRequest, *ClassifyResponse) error
+}
+
+func RegisterSpamHandler(s server.Server, hdlr SpamHandler, opts ...server.HandlerOption) error {
+	type spam interface {
+		Classify(ctx context.Context, in *ClassifyRequest, out *ClassifyResponse) error
+	}
+	type Spam struct {
+		spam
+	}
+	h := &spamHandler{hdlr}
+	return s.Handle(s.NewHandler(&Spam{h}, opts...))
+}
+
+type spamHandler struct {
+	SpamHandler
+}
+
+func (h *spamHandler) Classify(ctx context.Context, in *ClassifyRequest, out *ClassifyResponse) error {
+	return h.SpamHandler.Classify(ctx, in, out)
+}

spam/proto/spam.proto

@@ -0,0 +1,30 @@
+syntax = "proto3";
+
+package spam;
+
+option go_package = "./proto;spam";
+
+service Spam {
+	rpc Classify(ClassifyRequest) returns (ClassifyResponse) {}
+}
+
+// Check whether an email is likely to be spam based on its attributes
+message ClassifyRequest {
+	// The body of the email
+	string email_body = 1;
+	// The email address it is being sent to
+	string to = 2;
+	// The email address it has been sent from
+	string from = 3;
+	// The subject of the email
+	string subject = 4;
+}
+
+message ClassifyResponse {
+	// Is it spam? Returns true if its score is > 5
+	bool is_spam = 1;
+	// The score evaluated for this email. A higher number means it is more likely to be spam
+	double score = 2;
+	// The rules that have contributed to this score
+	repeated string details = 3;
+}

spam/publicapi.json

@@ -0,0 +1,6 @@
+{
+  "name": "spam",
+  "icon": "🚫",
+  "category": "communication",
+  "display_name": "Spam"
+}

spam/setup.md

@@ -0,0 +1,8 @@
+The spam API is powered by http://spamassassin.apache.org/. Specifically we run spamd which we then communicate with to classify emails.
+
+We run this as a separate container in the same k8s namespace. Simply run
+```shell
+kubectl apply -f spamassassin-k8s.yaml
+```
+
+Then deploy the spam service as normal.

spam/spamassassin-k8s.yaml

@@ -0,0 +1,35 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: spamd-latest
+  labels:
+    app: spamd
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: spamd
+  template:
+    metadata:
+      labels:
+        app: spamd
+    spec:
+      containers:
+        - name: spamd
+          image: instantlinux/spamassassin:latest
+          ports:
+            - containerPort: 783
+
+---
+
+apiVersion: v1
+kind: Service
+metadata:
+  name: spamd
+spec:
+  selector:
+    app: spamd
+  ports:
+    - protocol: TCP
+      port: 783
+      targetPort: 783