Initial commit

7 files changed, 202 insertions, 0 deletions

diff --git a/api/dto/entry.go b/api/dto/entry.go
new file mode 100644
index 0000000..85e39f3
--- /dev/null
+++ b/api/dto/entry.go
@@ -0,0 +1,9 @@
+package dto
+
+type CreateEntryRequest struct {
+	Title       string `json:"title"`
+	Kind        string `json:"kind"`
+	Url         string `json:"url"`
+	Description string `json:"description"`
+	Token       string `json:"token"`
+}
diff --git a/api/dto/response.go b/api/dto/response.go
new file mode 100644
index 0000000..2c13218
--- /dev/null
+++ b/api/dto/response.go
@@ -0,0 +1,38 @@
+package dto
+
+import "fmt"
+
+type Response interface {
+	Error() string
+	Status() int
+}
+
+type OkResponse struct {
+	Code int         `json:"code"`
+	Data interface{} `json:"data,omitempty"`
+}
+
+var _ Response = (*OkResponse)(nil)
+
+type ErrorResponse struct {
+	Code    int    `json:"code"`
+	Message string `json:"message"`
+}
+
+var _ Response = (*ErrorResponse)(nil)
+
+func (r *OkResponse) Status() int {
+	return r.Code
+}
+
+func (r *OkResponse) Error() string {
+	return fmt.Sprintf("HTTP status %d", r.Code)
+}
+
+func (r *ErrorResponse) Status() int {
+	return r.Code
+}
+
+func (r *ErrorResponse) Error() string {
+	return fmt.Sprintf("HTTP status %d: %s", r.Code, r.Message)
+}
diff --git a/api/dto/util.go b/api/dto/util.go
new file mode 100644
index 0000000..651f026
--- /dev/null
+++ b/api/dto/util.go
@@ -0,0 +1,54 @@
+package dto
+
+import (
+	"encoding/json"
+	"fmt"
+	"log/slog"
+	"net/http"
+
+	"github.com/go-playground/validator/v10"
+)
+
+var validate = validator.New(validator.WithRequiredStructEnabled())
+
+func ReadDto(r *http.Request, o interface{}) Response {
+	decoder := json.NewDecoder(r.Body)
+	if err := decoder.Decode(o); err != nil {
+		return &ErrorResponse{
+			Code:    http.StatusBadRequest,
+			Message: fmt.Errorf("Invalid request (%w)", err).Error(),
+		}
+	}
+
+	if err := validate.Struct(o); err != nil {
+		return &ErrorResponse{
+			Code:    http.StatusBadRequest,
+			Message: err.Error(),
+		}
+	}
+
+	return nil
+}
+
+func WrapResponseFunc(dtoFunc func(http.ResponseWriter, *http.Request) error) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		WriteDto(w, r, dtoFunc(w, r))
+	}
+}
+
+func WriteDto(w http.ResponseWriter, r *http.Request, err error) {
+	if o, ok := err.(Response); ok {
+		data, err := json.Marshal(o)
+		if err != nil {
+			w.WriteHeader(500)
+			slog.Error("could not serialise JSON", "error", err)
+			return
+		}
+		w.Header().Add("Content-Type", "application/json")
+		w.WriteHeader(o.Status())
+		w.Write(data)
+	} else {
+		w.WriteHeader(500)
+		slog.Error("internal server error handling request", "error", err)
+	}
+}
diff --git a/api/handlers/html.go b/api/handlers/html.go
new file mode 100644
index 0000000..dd5d4e8
--- /dev/null
+++ b/api/handlers/html.go
@@ -0,0 +1,27 @@
+package handlers
+
+import (
+	"net/http"
+
+	"git.leonardobishop.net/history/pkg/entries"
+	"git.leonardobishop.net/history/pkg/html"
+)
+
+func GetEntriesHtml(entriesService entries.Service, htmlService html.Service) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		entries, err := entriesService.GetEntries()
+		if err != nil {
+			w.WriteHeader(http.StatusInternalServerError)
+			return
+		}
+
+		html, err := htmlService.GenerateHtml(entries)
+		if err != nil {
+			w.WriteHeader(http.StatusInternalServerError)
+			return
+		}
+
+		w.Header().Set("Content-Type", "text/html;charset=UTF-8")
+		w.Write([]byte(html))
+	}
+}
diff --git a/api/handlers/record.go b/api/handlers/record.go
new file mode 100644
index 0000000..0f98f11
--- /dev/null
+++ b/api/handlers/record.go
@@ -0,0 +1,35 @@
+package handlers
+
+import (
+	"crypto/subtle"
+	"net/http"
+
+	"git.leonardobishop.net/history/api/dto"
+	"git.leonardobishop.net/history/pkg/entries"
+)
+
+func RecordEntry(service entries.Service, token string) http.HandlerFunc {
+	return dto.WrapResponseFunc(func(w http.ResponseWriter, r *http.Request) error {
+		var request dto.CreateEntryRequest
+		if err := dto.ReadDto(r, &request); err != nil {
+			return err
+		}
+
+		if subtle.ConstantTimeCompare([]byte(token), []byte(request.Token)) != 1 {
+			return &dto.ErrorResponse{
+				Code:    http.StatusForbidden,
+				Message: "Forbidden",
+			}
+		}
+
+		entry, err := service.CreateEntry(request.Title, request.Kind, request.Url, request.Description)
+		if err != nil {
+			return err
+		}
+
+		return &dto.OkResponse{
+			Code: http.StatusCreated,
+			Data: entry,
+		}
+	})
+}
diff --git a/api/middleware/cors.go b/api/middleware/cors.go
new file mode 100644
index 0000000..926c1ed
--- /dev/null
+++ b/api/middleware/cors.go
@@ -0,0 +1,12 @@
+package middleware
+
+import "net/http"
+
+func Cors(next http.HandlerFunc) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Access-Control-Allow-Origin", "*")
+		w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS")
+
+		next(w, r)
+	}
+}
diff --git a/api/router.go b/api/router.go
new file mode 100644
index 0000000..9ea7ac0
--- /dev/null
+++ b/api/router.go
@@ -0,0 +1,27 @@
+package api
+
+import (
+	"net/http"
+
+	"git.leonardobishop.net/history/api/handlers"
+	"git.leonardobishop.net/history/api/middleware"
+	"git.leonardobishop.net/history/internal/config"
+	"git.leonardobishop.net/history/pkg/entries"
+	"git.leonardobishop.net/history/pkg/html"
+)
+
+type ApiServices struct {
+	EntiresService entries.Service
+	HtmlService    html.Service
+
+	Config config.Config
+}
+
+func NewServer(api ApiServices) *http.ServeMux {
+	mux := http.NewServeMux()
+
+	mux.HandleFunc("POST /record", middleware.Cors(handlers.RecordEntry(api.EntiresService, api.Config.Token)))
+	mux.HandleFunc("GET /html", handlers.GetEntriesHtml(api.EntiresService, api.HtmlService))
+
+	return mux
+}