nexarch/dms/internal/autoruleapi/handler.go

// Package autoruleapi stellt die Pflege der Auto-Regeln (MET-05) ueber HTTP bereit.
package autoruleapi

import (
	"encoding/json"
	"errors"
	"net/http"
	"strings"

	"github.com/jackc/pgx/v5/pgxpool"

	"gitea.perlbach24.de/scripte/nexarch/dms/internal/autorule"
)

type Server struct{ pool *pgxpool.Pool }

func NewServer(pool *pgxpool.Pool) *Server { return &Server{pool: pool} }

func (s *Server) RegisterRoutes(mux *http.ServeMux) {
	mux.HandleFunc("GET /auto-rules", s.handleList)
	mux.HandleFunc("POST /auto-rules", s.handleCreate)
	mux.HandleFunc("PUT /auto-rules/{id}", s.handleUpdate)
	mux.HandleFunc("DELETE /auto-rules/{id}", s.handleDelete)
}

type ruleDTO struct {
	ID              string   `json:"id,omitempty"`
	Name            string   `json:"name"`
	Priority        int      `json:"priority"`
	Enabled         bool     `json:"enabled"`
	FilenamePattern *string  `json:"filename_pattern"`
	TextPattern     *string  `json:"text_pattern"`
	MimeType        *string  `json:"mime_type"`
	AddTagIDs       []string `json:"add_tag_ids"`
	DocumentTypeID  *string  `json:"document_type_id"`
	FolderID        *string  `json:"folder_id"`
	StopProcessing  bool     `json:"stop_processing"`
}

func toDTO(r autorule.Rule) ruleDTO {
	return ruleDTO{r.ID, r.Name, r.Priority, r.Enabled, r.FilenamePattern, r.TextPattern, r.MimeType, r.AddTagIDs, r.DocumentTypeID, r.FolderID, r.StopProcessing}
}

func (d ruleDTO) rule(id string) autorule.Rule {
	return autorule.Rule{ID: id, Name: d.Name, Priority: d.Priority, Enabled: d.Enabled, FilenamePattern: d.FilenamePattern, TextPattern: d.TextPattern,
		MimeType: d.MimeType, AddTagIDs: d.AddTagIDs, DocumentTypeID: d.DocumentTypeID, FolderID: d.FolderID, StopProcessing: d.StopProcessing}
}

func writeJSON(w http.ResponseWriter, status int, v any) {
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(status)
	_ = json.NewEncoder(w).Encode(v)
}

func writeError(w http.ResponseWriter, status int, msg string) {
	writeJSON(w, status, map[string]string{"error": msg})
}

func caller(w http.ResponseWriter, r *http.Request) (string, bool) {
	c := strings.TrimSpace(r.URL.Query().Get("caller"))
	if c == "" {
		writeError(w, http.StatusBadRequest, "fehlender pflicht-parameter \"caller\"")
		return "", false
	}
	return c, true
}

func fail(w http.ResponseWriter, err error) {
	switch {
	case errors.Is(err, autorule.ErrInvalidRule):
		writeError(w, http.StatusUnprocessableEntity, err.Error())
	case errors.Is(err, autorule.ErrNotFound):
		writeError(w, http.StatusNotFound, err.Error())
	default:
		writeError(w, http.StatusInternalServerError, err.Error())
	}
}

func (s *Server) handleList(w http.ResponseWriter, r *http.Request) {
	rules, err := autorule.List(r.Context(), s.pool)
	if err != nil {
		fail(w, err)
		return
	}
	out := make([]ruleDTO, len(rules))
	for i, rule := range rules {
		out[i] = toDTO(rule)
	}
	writeJSON(w, http.StatusOK, out)
}

func (s *Server) handleCreate(w http.ResponseWriter, r *http.Request) {
	actor, ok := caller(w, r)
	if !ok {
		return
	}
	var d ruleDTO
	if err := json.NewDecoder(r.Body).Decode(&d); err != nil {
		writeError(w, http.StatusBadRequest, "ungueltiger request-body: "+err.Error())
		return
	}
	rule, err := autorule.Create(r.Context(), s.pool, actor, d.rule(""))
	if err != nil {
		fail(w, err)
		return
	}
	writeJSON(w, http.StatusCreated, toDTO(rule))
}

func (s *Server) handleUpdate(w http.ResponseWriter, r *http.Request) {
	actor, ok := caller(w, r)
	if !ok {
		return
	}
	var d ruleDTO
	if err := json.NewDecoder(r.Body).Decode(&d); err != nil {
		writeError(w, http.StatusBadRequest, "ungueltiger request-body: "+err.Error())
		return
	}
	rule, err := autorule.Update(r.Context(), s.pool, actor, d.rule(r.PathValue("id")))
	if err != nil {
		fail(w, err)
		return
	}
	writeJSON(w, http.StatusOK, toDTO(rule))
}

func (s *Server) handleDelete(w http.ResponseWriter, r *http.Request) {
	actor, ok := caller(w, r)
	if !ok {
		return
	}
	if err := autorule.Delete(r.Context(), s.pool, actor, r.PathValue("id")); err != nil {
		fail(w, err)
		return
	}
	w.WriteHeader(http.StatusNoContent)
}