commit 63539b5bc13fdbfb1082e7ae810369d7c967315c Author: Anna Wiggins Date: Mon May 11 16:28:37 2020 +0000 Initial commit. diff --git a/Dockerfile b/Dockerfile new file mode 100644 index 0000000..bbda490 --- /dev/null +++ b/Dockerfile @@ -0,0 +1,22 @@ +FROM alpine:latest as env + +RUN apk --update add ca-certificates +RUN addgroup -S smartswitch && adduser -S smartswitch -G smartswitch + + +FROM golang:1.14 AS build + +WORKDIR /src +COPY . /src/ +RUN make + + +FROM alpine + +ENTRYPOINT ["/srv/smartswitch-server"] +USER smartswitch + +COPY --from=env /etc/passwd /etc/group /etc/ +COPY --from=build --chown=smartswitch /src/build/ /srv/ +COPY --from=env /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt + diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..5ffc01b --- /dev/null +++ b/Makefile @@ -0,0 +1,9 @@ +.PHONY: all build deps + +all: build + +build: + rm -rf build/ + mkdir build/ +# golint ./... + CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o build/smartswitch-server ./cmd/smartswitch-server diff --git a/build/smartswitch-server b/build/smartswitch-server new file mode 100755 index 0000000..947dec7 Binary files /dev/null and b/build/smartswitch-server differ diff --git a/cmd/smartswitch-server/main.go b/cmd/smartswitch-server/main.go new file mode 100644 index 0000000..06670b8 --- /dev/null +++ b/cmd/smartswitch-server/main.go @@ -0,0 +1,121 @@ +package main + +import ( + "encoding/json" + "io/ioutil" + "log" + "net/http" + + "github.com/spf13/viper" + "gopkg.in/yaml.v2" +) + +type webhook struct { + Name string + Path string + SecretKey string `yaml:"secret_key"` + NumSwitches int `yaml:"num_switches"` + MomentarySwitches []int `yaml:"momentary_switches"` + SwitchStates []int `json:switch_states` +} + +func debug(msg string, args ...interface{}) { + if viper.GetBool("Debug") { + log.Printf(msg, args...) + } +} + +func initWebhooks(filename string) { + bytes, err := ioutil.ReadFile(filename) + if err != nil { + log.Panicf("Couldn't read config file: %s", err) + } + + var hooks []webhook + + err = yaml.Unmarshal(bytes, &hooks) + if err != nil { + log.Panicf("Couldn't parse webhook file: %v", err) + } + + debug("Webhook definitions:") + debug("%v", hooks) + + for _, v := range hooks { + v.SwitchStates = make([]int, v.NumSwitches) + http.HandleFunc("/"+v.Path, makeWebhookHandler(v)) + } +} + +func runServer() { + http.ListenAndServe(":"+viper.GetString("ListenPort"), nil) +} + +func makeWebhookHandler(hook webhook) func(http.ResponseWriter, *http.Request) { + return func(w http.ResponseWriter, r *http.Request) { + // authentication check + keys, ok := r.URL.Query()["key"] + if !ok || len(keys) == 0 { + log.Printf("No key found for webhook: %s", hook.Name) + http.NotFound(w, r) + return + } + providedKey := keys[0] + + if providedKey == "" || providedKey != hook.SecretKey { + log.Printf("Failed to authenticate request for webhook: %s", hook.Name) + debug("Got key '%s', expected key '%s'", providedKey, hook.SecretKey) + http.NotFound(w, r) + return + } + + // now actually handle the request + if r.Method == "GET" { + webhookRead(hook, w, r) + + } else if r.Method == "POST" { + webhookWrite(hook, w, r) + } + } +} + +func webhookRead(hook webhook, w http.ResponseWriter, r *http.Request) { + err := json.NewEncoder(w).Encode(hook.SwitchStates) + + if err != nil { + log.Printf("Failed to send response: %v", err) + return + } + + // momentary switches have been read, so make sure they're 0 + // next time + for _, i := range hook.MomentarySwitches { + hook.SwitchStates[i] = 0 + } +} + +func webhookWrite(hook webhook, w http.ResponseWriter, r *http.Request) { + err := json.NewDecoder(r.Body).Decode(&hook.SwitchStates) + if err != nil { + log.Printf("Failed to parse json for '%s': %v", hook.Name, err) + http.Error(w, "Failed to parse json", http.StatusBadRequest) + return + } +} + +func main() { + // read environment config + viper.BindEnv("Debug", "DEBUG") + viper.BindEnv("WebhookFile", "WEBHOOK_CONFIG_FILE") + viper.BindEnv("ListenPort", "PORT") + + viper.SetDefault("ListenPort", "7200") + viper.SetDefault("WebhookFile", "./webhooks.yaml") + viper.SetDefault("Debug", false) + + // read webhook config + initWebhooks(viper.GetString("WebhookFile")) + + // serve app + runServer() +} diff --git a/docker-compose.yml b/docker-compose.yml new file mode 100644 index 0000000..68e9594 --- /dev/null +++ b/docker-compose.yml @@ -0,0 +1,13 @@ +version: '3.5' + +services: + app: + build: . + environment: + DEBUG: "true" + LISTEN_PORT: "7200" + WEBHOOK_CONFIG_FILE: "/config/webhooks.yml" + volumes: + - "./webhooks.yml.example:/config/webhooks.yml" + ports: + - "7200:7200" diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..0c8d5cd --- /dev/null +++ b/go.mod @@ -0,0 +1,8 @@ +module git.annabunch.es/annabunches/smartswitch-server + +go 1.14 + +require ( + github.com/spf13/viper v1.6.3 + gopkg.in/yaml.v2 v2.2.4 +) diff --git a/go.sum b/go.sum 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smartswitch devices + +This is a tiny webserver designed to receive webhooks that control +microcontrollers running [smartswitch](https://git.annabunch.es/annabunches/smartswitch/). + +## Configuration + +The server can be configured via the following environment variables: + +* DEBUG - if set, extra output will be logged / generated. **this will leak secrets to stdout** +* LISTEN_PORT - the TCP port to serve the app on. Default is `7200`. +* WEBHOOK_CONFIG_FILE - location of the webhook config. Defaults to `./webhooks.yaml`. + +The webhooks configuration file should be an array of entries with the following keys: + +* name - A human-readable name that explains the webhook's purpose. +* path - The webhook will be served by the app at this path. +* secret_key - An authentication value for reading and writing to the webhook. This must be included in all requests. (see Usage for format) +* num_switches - the number of data points / indexes expected with each POST. +* momentary_switches - an array of any indexes that refer to 'momentary' switches. + The value of these indexes will be reset to 0 after the next GET request to the webhook. + +## Build & Run + +Build the server with: + +``` +make build +``` + +And run with: + +``` +./smartswitch-server +``` + +A dockerfile is also included, along with a sample docker-compose.yml demonstrating +how the server might be run in a containerized environment. + +Note that you SHOULD always run this service behind a TLS-encrypted proxy. Using plain http WILL expose your secret keys. + + +## Usage + +To read the current webhook data, simply send a GET to the webhook URL, with the `key` parameter appropriately set. Example: + +``` +curl -x GET "https://example.com/WEBHOOK_PATH?key=WEBHOOK_KEY +``` + +To write data, send a POST to the same URL, with a json-formatted body in the following format: + +``` +[value0, value1, value2, ...] +``` diff --git a/webhooks.yml.example b/webhooks.yml.example new file mode 100644 index 0000000..f72983a --- /dev/null +++ b/webhooks.yml.example @@ -0,0 +1,26 @@ +# This example controls a single momentary switch. When the webhook is +# written, it will return 1 until it is read, after which it will return +# 0 again. +- name: Momentary Switch + path: Path_0 + secret_key: SecretKey_0 + num_switches: 1 + momentary_switches: + - 0 + +# This is three latched switches. They will always report their last +# written value +- name: Three Latched Switches + path: Path_1 + secret_key: SecretKey_1 + num_switches: 3 + momentary_switches: + +# The first and 3rd data point on this webhook are momentary switches. The other 3 are latched. +- name: Mix of Types + path: Path_2 + secret_key: SecretKey_2 + num_switches: 5 + momentary_switches: + - 0 + - 2