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.nova | ||
vendor | ||
.env | ||
config.yml |
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FROM golang:1.15.6 | ||
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RUN apt-get update -q && apt-get install -yq ca-certificates | ||
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ENV \ | ||
GO111MODULE=on \ | ||
CGO_ENABLED=0 \ | ||
GOOS=linux \ | ||
GOARCH=amd64 | ||
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WORKDIR /go/src/github.com/egeneralov/alert2gsm | ||
ADD go.mod go.sum /go/src/github.com/egeneralov/alert2gsm/ | ||
RUN go mod download | ||
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ADD . . | ||
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RUN go build -v -installsuffix cgo -ldflags="-w -s" -o /go/bin/alert2gsm . | ||
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FROM debian:buster | ||
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RUN apt-get update -q && apt-get install -yq ca-certificates | ||
USER nobody | ||
ENV PATH='/go/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin' | ||
CMD /go/bin/alert2gsm | ||
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COPY --from=0 /go/bin /go/bin |
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package main | ||
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import ( | ||
"bytes" | ||
"crypto/subtle" | ||
"encoding/base64" | ||
"encoding/json" | ||
"fmt" | ||
log "github.com/sirupsen/logrus" | ||
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"github.com/valyala/fasthttp" | ||
"github.com/vardius/gorouter/v4" | ||
) | ||
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type HTTPServerConfiguration struct { | ||
ExternalEndpoint string `yaml:"external_endpoint"` | ||
HTTP struct { | ||
Enabled bool `yaml:"enabled"` | ||
Listen string `yaml:"listen"` | ||
} `yaml:"http"` | ||
HTTPS struct { | ||
Enabled bool `yaml:"enabled"` | ||
Listen string `yaml:"listen"` | ||
SslCertificate string `yaml:"ssl_certificate"` | ||
SslCertificateKey string `yaml:"ssl_certificate_key"` | ||
} `yaml:"https"` | ||
Webhooks struct { | ||
Call struct { | ||
Enabled bool `yaml:"enabled"` | ||
} `yaml:"call"` | ||
Grafana struct { | ||
Enabled bool `yaml:"enabled"` | ||
Username string `yaml:"username"` | ||
Password string `yaml:"password"` | ||
PreMessage string `yaml:"pre_message"` | ||
} `yaml:"grafana"` | ||
Twilio struct { | ||
Enabled bool `yaml:"enabled"` | ||
Voice string `yaml:"voice"` | ||
Notify []string `yaml:"notify"` | ||
From string `yaml:"from"` | ||
} `yaml:"twilio"` | ||
} `yaml:"webhooks"` | ||
} | ||
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type HTTPServer struct { | ||
router gorouter.FastHTTPRouter | ||
requiredUser []byte | ||
requiredPassword []byte | ||
Configuration HTTPServerConfiguration | ||
Twilio Twilio | ||
logger string | ||
} | ||
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func (server *HTTPServer) Start() { | ||
log.Debug("HTTPServer.Start()") | ||
server.requiredUser = []byte(server.Configuration.Webhooks.Grafana.Username) | ||
server.requiredPassword = []byte(server.Configuration.Webhooks.Grafana.Password) | ||
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server.router = gorouter.NewFastHTTPRouter() | ||
if server.Configuration.Webhooks.Call.Enabled { | ||
server.router.GET("/call/", server.handlerCall) | ||
} | ||
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if server.Configuration.Webhooks.Twilio.Enabled { | ||
server.router.POST("/webhook/twilio/{id}.xml", server.handlerWebhookTwilio) | ||
} | ||
if server.Configuration.Webhooks.Grafana.Enabled { | ||
server.router.POST("/webhook/grafana/", server.handlerWebhookGrafana) | ||
server.router.USE("POST", "/webhook/grafana/", server.BasicAuth) | ||
} | ||
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if server.Configuration.HTTP.Enabled { | ||
// log.Infof("Starting http server at %v", server.Configuration.HTTP.Listen) | ||
log.WithFields(log.Fields{ | ||
"http": server.Configuration.HTTP, | ||
}).Info("Starting http server") | ||
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go func() { | ||
err := fasthttp.ListenAndServe(server.Configuration.HTTP.Listen, server.router.HandleFastHTTP) | ||
if err != nil { | ||
log.Fatal(err) | ||
} | ||
}() | ||
} | ||
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if server.Configuration.HTTPS.Enabled { | ||
go func() { | ||
var ( | ||
err error | ||
) | ||
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if server.Configuration.HTTPS.SslCertificate == "" || server.Configuration.HTTPS.SslCertificateKey == "" { | ||
tls_server := &fasthttp.Server{ | ||
Handler: server.router.HandleFastHTTP, | ||
} | ||
cert, priv, err := fasthttp.GenerateTestCertificate(server.Configuration.HTTPS.Listen) | ||
if err != nil { | ||
log.Fatal(err) | ||
} | ||
err = tls_server.AppendCertEmbed(cert, priv) | ||
if err != nil { | ||
log.Fatal(err) | ||
} | ||
log.WithFields(log.Fields{ | ||
"https": server.Configuration.HTTPS, | ||
"cert": cert, | ||
"priv": priv, | ||
}).Warn("Starting https server with auto-generated certificate - ssl_certificate or ssl_certificate_key are empty") | ||
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err = tls_server.ListenAndServeTLS(server.Configuration.HTTPS.Listen, "", "") | ||
if err != nil { | ||
log.Fatal(err) | ||
} | ||
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} else { | ||
log.WithFields(log.Fields{ | ||
"https": server.Configuration.HTTPS, | ||
}).Info("Starting https server") | ||
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err = fasthttp.ListenAndServeTLS( | ||
server.Configuration.HTTPS.Listen, | ||
server.Configuration.HTTPS.SslCertificate, | ||
server.Configuration.HTTPS.SslCertificateKey, | ||
server.router.HandleFastHTTP, | ||
) | ||
if err != nil { | ||
log.Fatal(err) | ||
} | ||
} | ||
}() | ||
} | ||
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} | ||
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func (server *HTTPServer) BasicAuth(next fasthttp.RequestHandler) fasthttp.RequestHandler { | ||
log.WithFields(log.Fields{ | ||
"next": next, | ||
}).Debug("BasicAuth") | ||
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var ( | ||
basicAuthPrefix = []byte("Basic ") | ||
) | ||
fn := func(ctx *fasthttp.RequestCtx) { | ||
auth := ctx.Request.Header.Peek("Authorization") | ||
if bytes.HasPrefix(auth, basicAuthPrefix) { | ||
// Check credentials | ||
payload, err := base64.StdEncoding.DecodeString(string(auth[len(basicAuthPrefix):])) | ||
if err == nil { | ||
pair := bytes.SplitN(payload, []byte(":"), 2) | ||
if len(pair) == 2 && subtle.ConstantTimeCompare(server.requiredUser, pair[0]) == 1 && subtle.ConstantTimeCompare(server.requiredPassword, pair[1]) == 1 { | ||
log.WithFields(log.Fields{ | ||
"ctx": ctx, | ||
}).Debug("Delegate request to the given handle, auth passed") | ||
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next(ctx) | ||
return | ||
} | ||
} | ||
} | ||
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log.WithFields(log.Fields{ | ||
"next": next, | ||
"ctx": ctx, | ||
}).Warn("Unauthorized") | ||
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// Request Basic Authentication otherwise | ||
ctx.Response.Header.Set("WWW-Authenticate", "Basic realm=Restricted") | ||
ctx.Error(fasthttp.StatusMessage(fasthttp.StatusUnauthorized), fasthttp.StatusUnauthorized) | ||
} | ||
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return fn | ||
} | ||
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func (server *HTTPServer) handlerCall(ctx *fasthttp.RequestCtx) { | ||
log.WithFields(log.Fields{ | ||
"ctx": ctx, | ||
}).Debug("HTTPServer.handlerCall") | ||
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msgBytes, _ := twilio.GenerateXML( | ||
[]string{ | ||
"Testing bridge from grafana to G S M call", | ||
}, | ||
server.Configuration.Webhooks.Twilio.Voice, | ||
) | ||
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server.Notify(msgBytes) | ||
} | ||
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func (server *HTTPServer) Notify(msgBytes []byte) { | ||
for _, to := range server.Configuration.Webhooks.Twilio.Notify { | ||
sid := RandStringRunes(10) | ||
storage[sid] = string(msgBytes) | ||
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queryURL := fmt.Sprintf( | ||
"%v/webhook/twilio/%v.xml", | ||
server.Configuration.ExternalEndpoint, sid, | ||
) | ||
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log.WithFields(log.Fields{ | ||
"sid": sid, | ||
"storage[sid]": storage[sid], | ||
"queryURL": queryURL, | ||
"to": to, | ||
}).Debug("I putting the call in queue") | ||
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resp, err := server.Twilio.QueueCall(to, queryURL) | ||
if err != nil { | ||
log.Error(err) | ||
continue | ||
} | ||
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logger := log.WithFields(log.Fields{ | ||
"sid": sid, | ||
"resp": resp, | ||
"to": to, | ||
}) | ||
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if resp.Status != "queued" { | ||
logger.Error("the call did not hit the queue") | ||
continue | ||
} | ||
logger.Info("the call is queued") | ||
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} | ||
} | ||
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func (server *HTTPServer) getSIDFromPath(path string) (string, error) { | ||
log.WithFields(log.Fields{ | ||
"path": path, | ||
}).Debug("HTTPServer.getSIDFromPath") | ||
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var ( | ||
result string | ||
err error | ||
) | ||
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reqSID := regexpWebhookTwilio.FindAllStringSubmatch(path, -1) | ||
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if err != nil { | ||
return result, err | ||
} | ||
if len(reqSID) > 0 { | ||
if len(reqSID[0]) == 2 { | ||
result = reqSID[0][1] | ||
} | ||
} | ||
return result, err | ||
} | ||
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func (server *HTTPServer) handlerWebhookTwilio(ctx *fasthttp.RequestCtx) { | ||
logger := log.WithFields(log.Fields{ | ||
"ctx": ctx, | ||
}) | ||
logger.Debug("HTTPServer.handlerWebhookTwilio") | ||
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sid, err := server.getSIDFromPath(string(ctx.Path())) | ||
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if err != nil { | ||
logger.Error("error 400: sid == nil") | ||
ctx.Error(fasthttp.StatusMessage(fasthttp.StatusBadRequest), fasthttp.StatusBadRequest) | ||
return | ||
} | ||
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if sid == "" { | ||
logger.Error("error 400: sid == nil") | ||
ctx.Error(fasthttp.StatusMessage(fasthttp.StatusBadRequest), fasthttp.StatusBadRequest) | ||
return | ||
} | ||
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body, exist := storage[sid] | ||
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if !exist { | ||
logger.Errorf("error 404: storage[\"%v\"] not found", sid) | ||
ctx.Error(fasthttp.StatusMessage(fasthttp.StatusNotFound), fasthttp.StatusNotFound) | ||
return | ||
} | ||
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ctx.Response.Header.Set("Content-type", "text/xml") | ||
fmt.Fprintf(ctx, body) | ||
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go func() { | ||
logger.Debug("sid removal task stared") | ||
delete(storage, sid) | ||
logger.Debug("sid removal task finished") | ||
}() | ||
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} | ||
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func (server *HTTPServer) handlerWebhookGrafana(ctx *fasthttp.RequestCtx) { | ||
logger := log.WithFields(log.Fields{ | ||
"ctx": ctx, | ||
}) | ||
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logger.Debug("HTTPServer.handlerWebhookGrafana") | ||
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var ( | ||
recived GrafanaHook | ||
err error | ||
) | ||
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err = json.Unmarshal(ctx.Request.Body(), &recived) | ||
if err != nil { | ||
logger.Errorf("json.Unmarshal error 400: %v", err) | ||
ctx.Error(fasthttp.StatusMessage(fasthttp.StatusBadRequest), fasthttp.StatusBadRequest) | ||
return | ||
} | ||
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go func() { | ||
msgBytes, _ := twilio.GenerateXML( | ||
[]string{ | ||
"", | ||
server.Configuration.Webhooks.Grafana.PreMessage, | ||
recived.Title, | ||
recived.Message, | ||
}, | ||
server.Configuration.Webhooks.Twilio.Voice, | ||
) | ||
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server.Notify(msgBytes) | ||
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}() | ||
} |
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MIT License | ||
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Copyright (c) 2021 Eduard Generalov | ||
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Permission is hereby granted, free of charge, to any person obtaining a copy | ||
of this software and associated documentation files (the "Software"), to deal | ||
in the Software without restriction, including without limitation the rights | ||
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
copies of the Software, and to permit persons to whom the Software is | ||
furnished to do so, subject to the following conditions: | ||
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The above copyright notice and this permission notice shall be included in all | ||
copies or substantial portions of the Software. | ||
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
SOFTWARE. | ||
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