Initial

Signed-off-by: Slendi <slendi@socopon.com>

.gitignore

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+static
+

flake.lock

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+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1745526057,
+        "narHash": "sha256-ITSpPDwvLBZBnPRS2bUcHY3gZSwis/uTe255QgMtTLA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "f771eb401a46846c1aebd20552521b233dd7e18b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "A simple pastebin service";
+
+  inputs = {
+    nixpkgs.url     = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { nixpkgs, flake-utils, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+      in
+				{
+					packages.default = pkgs.buildGoModule {
+						pname          = "slenpaste";
+						version        = "0.1.0";
+						src            = ./.;
+						goPackagePath  = "github.com/slendidev/slenpaste";
+					};
+
+					devShells.default = pkgs.mkShell {
+						buildInputs = [ pkgs.go pkgs.gopls ];
+					};
+
+					nixosModules.slenpaste = { lib, pkgs, config, ... }: {
+						# module function
+						options.services.slenpaste.enable = lib.mkEnableOption "Enable slenpaste service";
+						options.services.slenpaste.domain = lib.mkOption {
+							type        = lib.types.str;
+							default     = "localhost";
+							description = "Domain to serve pastes from";
+						};
+						options.services.slenpaste.listen = lib.mkOption {
+							type        = lib.types.str;
+							default     = "0.0.0.0:8080";
+							description = "Listen address (host:port)";
+						};
+						options.services.slenpaste.expireDur = lib.mkOption {
+							type        = lib.types.str;
+							default     = "0";
+							description = "Expiry duration (Go syntax, e.g. \"5m\", \"1h\" or \"0\" for none)";
+						};
+						options.services.slenpaste.expireOnView = lib.mkOption {
+							type        = lib.types.bool;
+							default     = false;
+							description = "Whether to expire on first view";
+						};
+
+						config = lib.mkIf config.services.slenpaste.enable {
+							systemd.services.slenpaste = {
+								description = "slenpaste HTTP paste service";
+								after       = [ "network.target" ];
+								wants       = [ "network.target" ];
+								serviceConfig = {
+									ExecStart = ''
+										${pkgs.slenpaste}/bin/slenpaste \
+											-domain ${config.services.slenpaste.domain} \
+											-listen ${config.services.slenpaste.listen} \
+											-expire ${config.services.slenpaste.expireDur} \
+											-expire-on-view=${toString config.services.slenpaste.expireOnView}
+									'';
+									Restart   = "on-failure";
+								};
+								wantedBy = [ "multi-user.target" ];
+							};
+						};
+					};
+				}
+    );
+}

go.mod

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+module github.com/slendidev/slenpaste
+
+go 1.24.2

main.go

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+package main
+
+import (
+	"encoding/json"
+	"flag"
+	"fmt"
+	"io"
+	"math/rand"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+)
+
+var (
+	domain       string
+	listenAddr   string
+	staticDir    string
+	expireDur    time.Duration
+	expireOnView bool
+)
+
+type meta struct {
+	Expiry       time.Time `json:"expiry"`
+	ExpireOnView bool      `json:"expire_on_view"`
+}
+
+func randomID(n int) string {
+	letters := []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
+	b := make([]rune, n)
+	for i := range b {
+		b[i] = letters[rand.Intn(len(letters))]
+	}
+	return string(b)
+}
+
+func indexHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Add("Content-Type", "text/html")
+	fmt.Fprintf(w, `<html><body><pre>Welcome to slenpaste!
+Upload via curl:
+  curl -F 'file=@yourfile.txt' http://%s/
+
+Or via wget:
+  wget --method=POST --body-file=yourfile.txt http://%s/
+</pre>
+<form enctype="multipart/form-data" method="post">
+	<input type="file" name="file">
+
+	<fieldset style="margin-top: 1rem">
+		<legend>Expiry:</legend>
+		<label><input type="radio" name="expiry" value="0" checked> Never</label>
+		<label><input type="radio" name="expiry" value="5m"> 5 minutes</label>
+		<label><input type="radio" name="expiry" value="1h"> 1 hour</label>
+		<label><input type="radio" name="expiry" value="24h"> 1 day</label>
+		<label><input type="radio" name="expiry" value="view"> Expire on first view</label>
+	</fieldset><br/>
+
+	<input type="submit" value="Upload">
+</form>
+</body></html>`, domain, domain)
+}
+
+func uploadHandler(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		http.Error(w, "Only POST allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	var reader io.Reader
+	if err := r.ParseMultipartForm(10 << 20); err == nil {
+		if file, _, err := r.FormFile("file"); err == nil {
+			defer file.Close()
+			reader = file
+		}
+	}
+	if reader == nil {
+		reader = r.Body
+		defer r.Body.Close()
+	}
+
+	expVal := r.FormValue("expiry")
+	var dur time.Duration
+	var onView bool
+	switch expVal {
+	case "view":
+		onView = true
+	case "0":
+		// no expiry
+	default:
+		dur, _ = time.ParseDuration(expVal)
+	}
+
+	id := randomID(6)
+	if err := os.MkdirAll(staticDir, 0755); err != nil {
+		http.Error(w, "Server error", http.StatusInternalServerError)
+		return
+	}
+	path := filepath.Join(staticDir, id)
+	out, err := os.Create(path)
+	if err != nil {
+		http.Error(w, "Save error", http.StatusInternalServerError)
+		return
+	}
+	defer out.Close()
+	if _, err := io.Copy(out, reader); err != nil {
+		http.Error(w, "Write error", http.StatusInternalServerError)
+		return
+	}
+
+	if dur > 0 || onView {
+		m := meta{ExpireOnView: onView}
+		if dur > 0 {
+			m.Expiry = time.Now().Add(dur)
+		}
+		metaBytes, _ := json.Marshal(m)
+		_ = os.WriteFile(path+".json", metaBytes, 0644)
+	}
+
+	fmt.Fprintf(w, "http://%s/%s\n", domain, id)
+}
+
+func viewHandler(w http.ResponseWriter, r *http.Request) {
+	id := strings.TrimPrefix(r.URL.Path, "/")
+	if id == "" {
+		indexHandler(w, r)
+		return
+	}
+	path := filepath.Join(staticDir, id)
+	metaPath := path + ".json"
+
+	// load and enforce metadata
+	if data, err := os.ReadFile(metaPath); err == nil {
+		var m meta
+		if err := json.Unmarshal(data, &m); err == nil {
+			if !m.Expiry.IsZero() && time.Now().After(m.Expiry) {
+				os.Remove(path)
+				os.Remove(metaPath)
+				http.NotFound(w, r)
+				return
+			}
+			if m.ExpireOnView {
+				defer os.Remove(path)
+				defer os.Remove(metaPath)
+			}
+		}
+	}
+
+	f, err := os.Open(path)
+	if err != nil {
+		http.NotFound(w, r)
+		return
+	}
+	defer f.Close()
+	w.Header().Set("Content-Type", "text/plain")
+	io.Copy(w, f)
+}
+
+func main() {
+	flag.StringVar(&domain, "domain", "localhost", "domain name for URLs")
+	flag.StringVar(&listenAddr, "listen", "0.0.0.0:8080", "listen address")
+	flag.StringVar(&staticDir, "static", "static", "directory to save pastes")
+	flag.DurationVar(&expireDur, "expire", 0, "time after which paste expires (e.g. 5m, 1h)")
+	flag.BoolVar(&expireOnView, "expire-on-view", false, "delete paste after it's viewed once")
+	flag.Parse()
+
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		if r.Method == http.MethodPost {
+			uploadHandler(w, r)
+		} else {
+			viewHandler(w, r)
+		}
+	})
+
+	fmt.Printf("slenpaste running at http://%s, storing in %s\n", listenAddr, staticDir)
+	http.ListenAndServe(listenAddr, nil)
+}