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server.go
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server.go
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package main
import (
"bytes"
"fmt"
"log/slog"
"net/http"
"os"
scyllaridae "github.com/lehigh-university-libraries/scyllaridae/internal/config"
"github.com/lehigh-university-libraries/scyllaridae/pkg/api"
)
type Server struct {
Config *scyllaridae.ServerConfig
}
func runHTTPServer(server *Server) {
http.HandleFunc("/healthcheck", func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
fmt.Fprintln(w, "OK")
})
// Use the method as the handler
http.HandleFunc("/", server.MessageHandler)
port := os.Getenv("PORT")
if port == "" {
port = "8080"
}
slog.Info("Server listening", "port", port)
if err := http.ListenAndServe(":"+port, nil); err != nil {
panic(err)
}
}
func (s *Server) MessageHandler(w http.ResponseWriter, r *http.Request) {
slog.Info(r.RequestURI, "method", r.Method, "ip", r.RemoteAddr, "proto", r.Proto)
if r.Method != http.MethodGet {
w.WriteHeader(http.StatusMethodNotAllowed)
return
}
defer r.Body.Close()
if r.Header.Get("Apix-Ldp-Resource") == "" && r.Header.Get("X-Islandora-Event") == "" {
http.Error(w, "Bad request", http.StatusBadRequest)
return
}
// Read the Alpaca message payload
auth := ""
if s.Config.ForwardAuth {
auth = r.Header.Get("Authorization")
}
message, err := api.DecodeAlpacaMessage(r, auth)
if err != nil {
slog.Error("Error decoding alpaca message", "err", err)
http.Error(w, "Internal error", http.StatusInternalServerError)
return
}
// Stream the file contents from the source URL
req, err := http.NewRequest("GET", message.Attachment.Content.SourceURI, nil)
if err != nil {
slog.Error("Error creating request to source", "source", message.Attachment.Content.SourceURI, "err", err)
http.Error(w, "Bad request", http.StatusBadRequest)
return
}
if s.Config.ForwardAuth {
req.Header.Set("Authorization", auth)
}
sourceResp, err := http.DefaultClient.Do(req)
if err != nil {
slog.Error("Error fetching source file contents", "err", err)
http.Error(w, "Internal error", http.StatusInternalServerError)
return
}
defer sourceResp.Body.Close()
if sourceResp.StatusCode != http.StatusOK {
slog.Error("SourceURI sent a bad status code", "code", sourceResp.StatusCode, "uri", message.Attachment.Content.SourceURI)
http.Error(w, "Bad request", http.StatusBadRequest)
return
}
cmd, err := scyllaridae.BuildExecCommand(message, s.Config)
if err != nil {
slog.Error("Error building command", "err", err)
http.Error(w, "Bad request", http.StatusBadRequest)
return
}
cmd.Stdin = sourceResp.Body
// Create a buffer to capture stderr
var stdErr bytes.Buffer
cmd.Stderr = &stdErr
// Send stdout to the ResponseWriter stream
cmd.Stdout = w
slog.Info("Running command", "cmd", cmd.String())
if err := cmd.Run(); err != nil {
slog.Error("Error running command", "cmd", cmd.String(), "err", stdErr.String())
http.Error(w, "Internal error", http.StatusInternalServerError)
return
}
}