Add functionality to upload images to S3

This change adds the following functionality:

- Add the motion detection image to a S3 bucket.
- Pass a presigned URL linking to the image in the JSON payload of the
  MQTT event message.
- Add the possibility of customizing whether images are uploaded to a S3
  bucket or not.

Change-Id: Id82401839e92dbc62f3bbd1e7e7f0adeeb5718a6
diff --git a/cmd/hichipbridge/Dockerfile b/cmd/hichipbridge/Dockerfile
index f303928..403ae14 100644
--- a/cmd/hichipbridge/Dockerfile
+++ b/cmd/hichipbridge/Dockerfile
@@ -17,6 +17,7 @@
 RUN go install github.com/eclipse/paho.mqtt.golang
 RUN go install github.com/flashmob/go-guerrilla
 RUN go install github.com/go-sql-driver/mysql
+RUN go install github.com/minio/minio-go/v7
 RUN go install github.com/sirupsen/logrus
 RUN go install github.com/spf13/cobra
 RUN go install gomodules.avm99963.com/forks/parsemail
diff --git a/cmd/hichipbridge/env.sample b/cmd/hichipbridge/env.sample
index ae7017f..6b79851 100644
--- a/cmd/hichipbridge/env.sample
+++ b/cmd/hichipbridge/env.sample
@@ -12,3 +12,15 @@
 HICHIPBRIDGE_MQTT_TOPIC=hichipbridge
 # Token for the email notifications
 HICHIPBRIDGE_EMAIL_TOKEN=superconfidentialtoken;)
+# Whether images should be saved in a S3 storage bucket (true/false)
+HICHIPBRIDGE_S3_ENABLED=false
+# The S3 storage endpoint
+HICHIPBRIDGE_S3_ENDPOINT=s3.example.com
+# The S3 access key ID
+HICHIPBRIDGE_S3_ACCESS_KEY=username
+# The S3 secret access key
+HICHIPBRIDGE_S3_SECRET_KEY=password
+# Whether S3 uses SSL (true/false)
+HICHIPBRIDGE_S3_USE_SSL=true
+# The S3 bucket name
+HICHIPBRIDGE_S3_BUCKET=hichipbridge
diff --git a/cmd/hichipbridge/serve.go b/cmd/hichipbridge/serve.go
index 17b944e..05c3048 100644
--- a/cmd/hichipbridge/serve.go
+++ b/cmd/hichipbridge/serve.go
@@ -146,6 +146,12 @@
 		"MQTT_PASSWORD",
 		"MQTT_TOPIC",
 		"EMAIL_TOKEN",
+		"S3_ENABLED",
+		"S3_ENDPOINT",
+		"S3_ACCESS_KEY",
+		"S3_SECRET_KEY",
+		"S3_USE_SSL",
+		"S3_BUCKET",
 	}
 
 	// Load in the config.
@@ -185,6 +191,12 @@
 		"mqtt_password":     envs["MQTT_PASSWORD"],
 		"mqtt_topic":        envs["MQTT_TOPIC"],
 		"mqtt_email_token":  envs["EMAIL_TOKEN"],
+		"s3_enabled":        envs["S3_ENABLED"],
+		"s3_endpoint":       envs["S3_ENDPOINT"],
+		"s3_access_key":     envs["S3_ACCESS_KEY"],
+		"s3_secret_key":     envs["S3_SECRET_KEY"],
+		"s3_use_ssl":        envs["S3_USE_SSL"],
+		"s3_bucket":         envs["S3_BUCKET"],
 	}
 
 	for i, _ := range appConfig.Servers {
diff --git a/go.mod b/go.mod
index 775389b..16cca89 100644
--- a/go.mod
+++ b/go.mod
@@ -7,6 +7,7 @@
 	github.com/eclipse/paho.mqtt.golang v1.3.1
 	github.com/flashmob/go-guerrilla v1.6.1
 	github.com/go-sql-driver/mysql v1.5.0
+	github.com/minio/minio-go/v7 v7.0.7
 	github.com/sirupsen/logrus v1.7.0
 	github.com/spf13/cobra v1.1.1
 	gomodules.avm99963.com/forks/parsemail v0.0.0-20210122134334-731e54968e51
diff --git a/go.sum b/go.sum
index e03125a..415ce36 100644
--- a/go.sum
+++ b/go.sum
@@ -26,6 +26,7 @@
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@@ -38,9 +39,11 @@
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@@ -66,10 +69,13 @@
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@@ -102,11 +108,16 @@
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@@ -114,18 +125,36 @@
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@@ -147,6 +176,8 @@
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 golang.org/x/crypto v0.0.0-20181029021203-45a5f77698d3/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/crypto v0.0.0-20190513172903-22d7a77e9e5f/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
+golang.org/x/crypto v0.0.0-20200709230013-948cd5f35899 h1:DZhuSZLsGlFL4CmhA8BcRA0mnthyA/nZ00AqCUo7vHg=
+golang.org/x/crypto v0.0.0-20200709230013-948cd5f35899/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190510132918-efd6b22b2522/go.mod h1:ZjyILWgesfNpC6sMxTJOJm9Kp84zZh5NQWvqDGG3Qr8=
@@ -220,6 +257,8 @@
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20200425230154-ff2c4b7c35a0 h1:Jcxah/M+oLZ/R4/z5RzfPzGbPXnVDPkEDtf2JnuxN+U=
 golang.org/x/net v0.0.0-20200425230154-ff2c4b7c35a0/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
+golang.org/x/net v0.0.0-20200707034311-ab3426394381 h1:VXak5I6aEWmAXeQjA+QSZzlgNrpq9mjcfDemuexIKsU=
+golang.org/x/net v0.0.0-20200707034311-ab3426394381/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
@@ -235,6 +274,7 @@
 golang.org/x/sys v0.0.0-20181107165924-66b7b1311ac8/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190312061237-fead79001313/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190502145724-3ef323f4f1fd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -244,10 +284,14 @@
 golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd h1:xhmwyvizuTgC2qz7ZlMluP20uW+C3Rm0FD/WLDX8884=
 golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae h1:Ih9Yo4hSPImZOpfGuA4bR/ORKTAbhZo2AbWNRCnevdo=
+golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
+golang.org/x/text v0.3.3 h1:cokOdA+Jmi5PJGXLlLllQSgYigAEfHXJAERHVMaCc2k=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/tools v0.0.0-20180221164845-07fd8470d635/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
@@ -296,9 +340,12 @@
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/ini.v1 v1.57.0 h1:9unxIsFcTt4I55uWluz+UmL95q4kdJ0buvQ1ZIqVQww=
+gopkg.in/ini.v1 v1.57.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
 gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
diff --git a/mqtt_processor/mqtt_processor.go b/mqtt_processor/mqtt_processor.go
index 256c469..e965702 100644
--- a/mqtt_processor/mqtt_processor.go
+++ b/mqtt_processor/mqtt_processor.go
@@ -2,8 +2,12 @@
 
 import (
 	"bufio"
+	"context"
 	"encoding/json"
 	"fmt"
+	"net/url"
+	"strings"
+	"time"
 
 	"github.com/flashmob/go-guerrilla/backends"
 	"github.com/flashmob/go-guerrilla/mail"
@@ -12,6 +16,9 @@
 	"gomodules.avm99963.com/forks/parsemail"
 
 	"github.com/eclipse/paho.mqtt.golang"
+
+	"github.com/minio/minio-go/v7"
+	"github.com/minio/minio-go/v7/pkg/credentials"
 )
 
 const subtopicStatus = "status"
@@ -23,11 +30,18 @@
 	MQTTPassword string `json:"mqtt_password"`
 	MQTTTopic    string `json:"mqtt_topic"`
 	EmailToken   string `json:"mqtt_email_token"`
+	S3Enabled    string `json:"s3_enabled"`
+	S3Endpoint   string `json:"s3_endpoint"`
+	S3AccessKey  string `json:"s3_access_key"`
+	S3SecretKey  string `json:"s3_secret_key"`
+	S3UseSSL     string `json:"s3_use_ssl"`
+	S3Bucket     string `json:"s3_bucket"`
 }
 
 type motionEvent struct {
 	Timestamp int64  `json:"timestamp"`
 	CameraID  string `json:"-"`
+	ImageURL  string `json:"image_url"`
 }
 
 func hasToken(email *parsemail.Email, config *MQTTConfig) bool {
@@ -39,7 +53,34 @@
 	return email.TextBody == "Y-Token: "+config.EmailToken
 }
 
-func processMotionEvent(e *mail.Envelope, config *MQTTConfig) (*motionEvent, error) {
+func uploadImage(email *parsemail.Email, cameraID string, config *MQTTConfig, s3c *minio.Client) (string, error) {
+	for _, a := range email.Attachments {
+		if strings.HasPrefix(a.ContentType, "image") {
+			// Upload image
+			ctx := context.Background()
+			fileName := cameraID + "/" + a.Filename
+			n, err := s3c.PutObject(ctx, config.S3Bucket, fileName, a.Data, -1, minio.PutObjectOptions{ContentType: a.ContentType})
+			if err != nil {
+				return "", err
+			}
+
+			// Get image URL
+			reqParams := make(url.Values)
+			u, err := s3c.PresignedGetObject(ctx, config.S3Bucket, n.Key, time.Duration(2*24)*time.Hour, reqParams)
+			if err != nil {
+				return "", err
+			}
+
+			return u.String(), nil
+		}
+	}
+
+	backends.Log().Info("The message doesn't contain an image attachment")
+
+	return "", nil
+}
+
+func processMotionEvent(e *mail.Envelope, config *MQTTConfig, s3c *minio.Client) (*motionEvent, error) {
 	event := &motionEvent{}
 
 	dataReader := bufio.NewReader(&e.Data)
@@ -55,11 +96,20 @@
 	event.CameraID = e.MailFrom.User
 	event.Timestamp = email.Date.Unix()
 
+	if config.S3Enabled == "true" {
+		imageURL, err := uploadImage(&email, event.CameraID, config, s3c)
+		if err != nil {
+			return event, err
+		}
+
+		event.ImageURL = imageURL
+	}
+
 	return event, nil
 }
 
-func processEmail(e *mail.Envelope, c mqtt.Client, config *MQTTConfig) error {
-	event, err := processMotionEvent(e, config)
+func processEmail(e *mail.Envelope, c mqtt.Client, s3c *minio.Client, config *MQTTConfig) error {
+	event, err := processMotionEvent(e, config, s3c)
 	if err != nil {
 		return err
 	}
@@ -83,7 +133,8 @@
 
 var Processor = func() backends.Decorator {
 	var (
-		c mqtt.Client
+		c   mqtt.Client
+		s3c *minio.Client
 	)
 
 	config := &MQTTConfig{}
@@ -115,6 +166,18 @@
 			return token.Error()
 		}
 
+		// Set up the minio client if S3 storage is enabled
+		if config.S3Enabled == "true" {
+			var err error
+			s3c, err = minio.New(config.S3Endpoint, &minio.Options{
+				Creds:  credentials.NewStaticV4(config.S3AccessKey, config.S3SecretKey, ""),
+				Secure: config.S3UseSSL == "true",
+			})
+			if err != nil {
+				return err
+			}
+		}
+
 		backends.Log().Debug("MQTT client successfully started and connected")
 
 		return nil
@@ -128,7 +191,7 @@
 					// We don't validate the recipient
 					return p.Process(e, task)
 				} else if task == backends.TaskSaveMail {
-					err := processEmail(e, c, config)
+					err := processEmail(e, c, s3c, config)
 					if err != nil {
 						backends.Log().WithError(err).Error("Could not handle email")
 						return backends.NewResult("554 Error: could not handle email"), err