Make it easy for people to check if you are alive or not.
git clone
Log | Files | Refs | README | LICENSE

commit 7eca66545fbe99dcc507d9a30a965c4681c26b22
Author: Agastya Chandrakant <>
Date:   Thu, 17 Mar 2022 15:41:55 +0530

Initial commit.

A.gitignore | 5+++++
ALICENSE | 661+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
AREADME | 53+++++++++++++++++++++++++++++++++++++++++++++++++++++
Aam-i-alive.db | 0
Aconfig/config.go | 10++++++++++
Aconsts/consts.go | 15+++++++++++++++
Ago.mod | 5+++++
Ago.sum | 2++
Ahandlers/get-home-page-utils.go | 92+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Ahandlers/get-home-page.go | 13+++++++++++++
Ahandlers/handler-utils.go | 33+++++++++++++++++++++++++++++++++
Ahandlers/update-last-active-utils.go | 80+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Ahandlers/update-last-active.go | 12++++++++++++
Ainit-db.sql | 9+++++++++
Ajson-structs/structs.go | 28++++++++++++++++++++++++++++
Amakefile | 6++++++
Asrc/main.go | 17+++++++++++++++++
17 files changed, 1041 insertions(+), 0 deletions(-)

diff --git a/.gitignore b/.gitignore @@ -0,0 +1,5 @@ +# binary +amialive + +# log file +logging.log diff --git a/LICENSE b/LICENSE @@ -0,0 +1,661 @@ + GNU AFFERO GENERAL PUBLIC LICENSE + Version 3, 19 November 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. <> + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU Affero General Public License is a free, copyleft license for +software and other kinds of works, specifically designed to ensure +cooperation with the community in the case of network server software. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. By contrast, +our General Public Licenses are intended to guarantee your freedom to +share and change all versions of a program--to make sure it remains free +software for all its users. + + When we speak of free software, we are referring to freedom, not +price. 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If not, see <>. + +Also add information on how to contact you by electronic and paper mail. + + If your software can interact with users remotely through a computer +network, you should also make sure that it provides a way for users to +get its source. For example, if your program is a web application, its +interface could display a "Source" link that leads users to an archive +of the code. There are many ways you could offer source, and different +solutions will be better for different programs; see section 13 for the +specific requirements. + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU AGPL, see +<>. diff --git a/README b/README @@ -0,0 +1,53 @@ + _ _ _ + __ _ _ __ ___ (_) __ _| (_)_ _____ + / _` | '_ ` _ \ | | / _` | | \ \ / / _ \ +| (_| | | | | | | | | | (_| | | |\ V / __/ + \__,_|_| |_| |_| |_| \__,_|_|_| \_/ \___| +=========================================== + +Make it easy for people to check if you are alive or not. + +Requirements +============ +0. sqlite3 + +Installation +============ + +$ git clone +$ cd am-i-alive-go +$ sqlite3 am-i-alive.db -init init-db.sql +$ make // or go build -o amialive src/main.go + +Configuration +============= + +Update config/config.go to +0. Port : Specify which port to run the server. +1. Auth : Authentication password. +2. Name : Name by which you are known. +3. DB : Path to DB. +4. Logfile : Path to logging GET requests. +5. ShouldLog : If GET requests should be logged or not. + +Usage +===== + +Try running the following command to see if the tool is working fine. + +$ curl -XPOST -H "Content-type: application/json" -d '{ "auth": "YOUR-PASSWORD" }' '' + +Run this command periodically so others know if you are alive or not. +I have placed the command in my .zshrc. +I use my terminal a lot, and therefore it updates my status regularly. + +People who want to know your status can run the following command to check on you. + +$ curl -XGET '' + +If someone who wants to know about you is not user to cUrl, they can still open the URL to see the message. + +Sure, the message is not as pretty. +But it should not take much time to set up a front-end to this. + +This is a very minimal tool under a free license. Tweak it to your liking. diff --git a/am-i-alive.db b/am-i-alive.db Binary files differ. diff --git a/config/config.go b/config/config.go @@ -0,0 +1,10 @@ +package config + +const ( + Port = ":3000" + Auth = "43421613610ece95364eb358372e43bb49e75e7fc833a3ee91fcf9b1e2cce5134b93a474bd15e046d4e6c46c603ca1ec49dadc82af3c7c82db99521626aa72ea" + Name = "johndoe" + DB = "path/to/am-i-alive.db" + Logfile = "path/to/logging.log" + ShouldLog = true +) diff --git a/consts/consts.go b/consts/consts.go @@ -0,0 +1,15 @@ +package consts + +const ( + Offset = 164 * 10_000_000 + Ms = 1_000 + Sec2hr = 3_600 + SQLITE3 = "sqlite3" +) + +const ( + T_4hr = 4 * Sec2hr + T_18hr = 18 * Sec2hr + T_60hr = 60 * Sec2hr + T_5d = 120 * Sec2hr +) diff --git a/go.mod b/go.mod @@ -0,0 +1,5 @@ +module + +go 1.17 + +require v1.14.12 // indirect diff --git a/go.sum b/go.sum @@ -0,0 +1,2 @@ v1.14.12 h1:TJ1bhYJPV44phC+IMu1u2K/i5RriLTPe+yc68XDJ1Z0= v1.14.12/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU= diff --git a/handlers/get-home-page-utils.go b/handlers/get-home-page-utils.go @@ -0,0 +1,92 @@ +package handlers + +import ( + "database/sql" + "encoding/json" + "fmt" + "net/http" + "time" + + "" + "" + JsonStructs "" +) + +func getRespForHomePage(r *http.Request) (header int, resp []byte) { + if r.Method != http.MethodGet { + header = http.StatusMethodNotAllowed + err_msg := "Method not allowed." + resp, _ = json.Marshal(JsonStructs.ErrJson{Err: err_msg}) + } else { + if msg, lastseen, unix, err := fetchUpdatedAtMsg(); err != nil { + header = http.StatusInternalServerError + resp, _ = json.Marshal(JsonStructs.ErrJson{Err: err.Error()}) + } else { + header = http.StatusOK + if lastseen == "" { + resp, _ = json.Marshal(JsonStructs.NotStartedJson{Message: msg}) + } else { + resp, _ = json.Marshal(JsonStructs.ResJson{Message: msg, Lastseen: lastseen, Unix: unix}) + } + } + } + return header, resp +} + +func fetchUpdatedAtMsg() (msg string, lastseen string, unix int64, err error) { + db, err := open_db() + defer db.Close() + + if err == nil { + if updated_at, err := queryUpdatedAt(db); err == nil { + if updated_at == 0 { + msg = fmt.Sprintf("%s has not started using this tool yet.", config.Name) + } else { + lastseen, unix = getLastSeen(updated_at) + msg = getMsgBasedOn(updated_at) + } + } + } + return msg, lastseen, unix, err +} + +// Get seconds between RIGHT NOW, and when was the last update. +func getDiff(updated_at int64) (diff int64) { + now := time.Now().Unix() - consts.Offset // since updated_at is decreased by offset. + diff = now - updated_at + return diff +} + +// Get the last updated_at (UNIX timestamp - offset) for the userid from DB. +func queryUpdatedAt(db *sql.DB) (res int64, err error) { + query_str := "SELECT updatedat FROM alive WHERE id=0" + row := db.QueryRow(query_str) + err = row.Scan(&res) + return res, err +} + +// Get lastseen string and UNIX (milli) timestamp based on last updated_at (UNIX timestamp - offset). +func getLastSeen(updated_at int64) (lastseen string, unix int64) { + secs := (updated_at + consts.Offset) + unix = secs * consts.Ms + datetime := time.Unix(secs, 0).UTC().Format(time.RFC1123) + lastseen = fmt.Sprintf("%s was last active around %s+0000 (Coordinated Universal Time).", config.Name, datetime) + return lastseen, unix +} + +// depending on diff in seconds from last updated and now, get a formatted message. +func getMsgBasedOn(updated_at int64) (msg string) { + diff := getDiff(updated_at) + if diff >= 0 && diff <= consts.T_4hr { + msg = fmt.Sprintf("%s is most certainly alive.", config.Name) + } else if diff > consts.T_4hr && diff <= consts.T_18hr { + msg = fmt.Sprintf("%s is most certainly AFK.", config.Name) + } else if diff > consts.T_18hr && diff <= consts.T_60hr { + msg = fmt.Sprintf("%s has been away for quite some time now. You might want to check on him.", config.Name) + } else if diff > consts.T_60hr && diff <= consts.T_5d { + msg = fmt.Sprintf("%s has been away for rather too long. If %s didn't tell you he will be gone for so long, *please* check on him!", config.Name, config.Name) + } else { + msg = fmt.Sprintf("%s is most certainly dead.", config.Name) + } + return msg +} diff --git a/handlers/get-home-page.go b/handlers/get-home-page.go @@ -0,0 +1,13 @@ +package handlers + +import ( + "net/http" +) + +func GetHomePage(rw http.ResponseWriter, r *http.Request) { + go logRequest(r) + rw.Header().Set("Content-Type", "application/json") + header, resp := getRespForHomePage(r) + rw.WriteHeader(header) + rw.Write(resp) +} diff --git a/handlers/handler-utils.go b/handlers/handler-utils.go @@ -0,0 +1,33 @@ +package handlers + +import ( + "database/sql" + "fmt" + "log" + "net/http" + "os" + "time" + + "" + "" + _ "" +) + +func open_db() (db *sql.DB, err error) { + db, err = sql.Open(consts.SQLITE3, config.DB) + return db, err +} + +func logRequest(r *http.Request) { + if config.ShouldLog { + file, err := os.OpenFile(config.Logfile, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0600) + defer file.Close() + if err != nil { + log.Fatalf("Error %v", err) + } + R := fmt.Sprintf("%s %#v -- %#v\n\n", time.Now(), r, r.URL) + if _, err = file.Write([]byte(R)); err != nil { + log.Fatalf("Error %v", err) + } + } +} diff --git a/handlers/update-last-active-utils.go b/handlers/update-last-active-utils.go @@ -0,0 +1,80 @@ +package handlers + +import ( + "crypto/sha512" + "database/sql" + "encoding/hex" + "encoding/json" + "fmt" + "io" + "net/http" + "time" + + "" + "" + JsonStructs "" +) + +func getRespForUpdateLastActive(r *http.Request) (header int, resp []byte) { + is_db_updated := false + if r.Method != http.MethodPost { // if method was not POST + header = http.StatusMethodNotAllowed + err_msg := "Method not allowed." + resp, _ = json.Marshal(JsonStructs.ErrJson{Err: err_msg}) + } else { + if err, res := isAuthFailed(r.Body); res == true { // if auth failed. + header = http.StatusUnauthorized + err_msg := err.Error() + resp, _ = json.Marshal(JsonStructs.AuthFailErrJson{Err: err_msg, Updated: is_db_updated}) + } else { + if err := tryUpdatingDb(); err != nil { // if error occurred while updating DB. + header = http.StatusInternalServerError + err_msg := err.Error() + resp, _ = json.Marshal(JsonStructs.AuthFailErrJson{Err: err_msg, Updated: is_db_updated}) + } else { + is_db_updated = true + header = http.StatusOK + resp, _ = json.Marshal(JsonStructs.AuthSuccessJson{Updated: is_db_updated}) + } + } + } + return header, resp +} + +func tryUpdatingDb() (err error) { + db, err := open_db() + defer db.Close() + + if err == nil { + err = queryUpdateLastSeen(db) + } + return err +} + +// Update DB to store updated at as (UNIX timestamp - offset) +func queryUpdateLastSeen(db *sql.DB) (err error) { + now := time.Now().Unix() - consts.Offset + query_str := "UPDATE alive SET updatedat = ? WHERE id = 0" + stmt, err := db.Prepare(query_str) + _, err = stmt.Exec(now) + stmt.Close() + return err +} + +// Check if sha512 of the auth sent in the request body is same as in the config. +func isAuthFailed(body io.ReadCloser) (err error, isFailed bool) { + isFailed = true + decoder := json.NewDecoder(body) + var auth JsonStructs.AuthJson + if err = decoder.Decode(&auth); err == nil { + s := sha512.New() + s.Write([]byte(auth.Auth)) + received_auth_hash := fmt.Sprint(hex.EncodeToString(s.Sum(nil))) + if config.Auth != received_auth_hash { + err = fmt.Errorf("Incorrect credentials.") + } else { + isFailed = false + } + } + return err, isFailed +} diff --git a/handlers/update-last-active.go b/handlers/update-last-active.go @@ -0,0 +1,12 @@ +package handlers + +import ( + "net/http" +) + +func UpdateLastActive(rw http.ResponseWriter, r *http.Request) { + rw.Header().Set("Content-Type", "application/json") + header, resp := getRespForUpdateLastActive(r) + rw.WriteHeader(header) + rw.Write(resp) +} diff --git a/init-db.sql b/init-db.sql @@ -0,0 +1,9 @@ +-- CreateTable +CREATE TABLE "alive" ( + "id" INTEGER NOT NULL PRIMARY KEY, + "updatedat" INTEGER NOT NULL +); + +-- FirstEntry +INSERT INTO "alive" (id, updatedat) VALUES (0, 0); + diff --git a/json-structs/structs.go b/json-structs/structs.go @@ -0,0 +1,28 @@ +package JsonStructs + +type ErrJson struct { + Err string `json:"err"` +} + +type ResJson struct { + Message string `json:"message"` + Lastseen string `json:"lastseen"` + Unix int64 `json:"unix"` +} + +type NotStartedJson struct { + Message string `json:"message"` +} + +type AuthJson struct { + Auth string `json:"auth"` +} + +type AuthFailErrJson struct { + Err string `json:"err"` + Updated bool `json:"updated"` +} + +type AuthSuccessJson struct { + Updated bool `json:"updated"` +} diff --git a/makefile b/makefile @@ -0,0 +1,6 @@ +build: + go build -o amialive src/main.go +dev: + make build && ./amialive +clean: + rm -f ./amialive diff --git a/src/main.go b/src/main.go @@ -0,0 +1,17 @@ +package main + +import ( + "fmt" + "log" + "net/http" + + "" + "" +) + +func main() { + http.HandleFunc("/", handlers.GetHomePage) + http.HandleFunc("/update", handlers.UpdateLastActive) + fmt.Printf("Starting server on port %s.\n", config.Port) + log.Fatal(http.ListenAndServe(config.Port, nil)) +}