hatecomputers.club/api/dns.go

package api

import (
	"database/sql"
	"fmt"
	"log"
	"net/http"
	"strconv"
	"strings"

	"git.hatecomputers.club/hatecomputers/hatecomputers.club/adapters"
	"git.hatecomputers.club/hatecomputers/hatecomputers.club/database"
	"git.hatecomputers.club/hatecomputers/hatecomputers.club/utils"
)

const MAX_USER_RECORDS = 65

var USER_OWNED_INTERNAL_FMT_DOMAINS = []string{"%s", "%s.endpoints"}

func userCanFuckWithDNSRecord(dbConn *sql.DB, user *database.User, record *database.DNSRecord, ownedInternalDomainFormats []string) bool {
	ownedByUser := (user.ID == record.UserID)
	if !ownedByUser {
		return false
	}

	if !record.Internal {
		for _, format := range ownedInternalDomainFormats {
			domain := fmt.Sprintf(format, user.Username)

			isInSubDomain := strings.HasSuffix(record.Name, "."+domain)
			if domain == record.Name || isInSubDomain {
				return true
			}
		}
		return false
	}

	owner, err := database.FindFirstDomainOwnerId(dbConn, record.Name)
	if err != nil {
		log.Println(err)
		return false
	}

	userIsOwnerOfDomain := owner == user.ID
	return ownedByUser && userIsOwnerOfDomain
}

func ListDNSRecordsContinuation(context *RequestContext, req *http.Request, resp http.ResponseWriter) ContinuationChain {
	return func(success Continuation, failure Continuation) ContinuationChain {
		dnsRecords, err := database.GetUserDNSRecords(context.DBConn, context.User.ID)
		if err != nil {
			log.Println(err)
			resp.WriteHeader(http.StatusInternalServerError)
			return failure(context, req, resp)
		}

		(*context.TemplateData)["DNSRecords"] = dnsRecords
		return success(context, req, resp)
	}
}

func CreateDNSRecordContinuation(dnsAdapter external_dns.ExternalDNSAdapter) func(context *RequestContext, req *http.Request, resp http.ResponseWriter) ContinuationChain {
	return func(context *RequestContext, req *http.Request, resp http.ResponseWriter) ContinuationChain {
		return func(success Continuation, failure Continuation) ContinuationChain {
			formErrors := FormError{
				Errors: []string{},
			}

			internal := req.FormValue("internal") == "on"
			name := req.FormValue("name")
			if internal && !strings.HasSuffix(name, ".") {
				name += "."
			}

			recordType := req.FormValue("type")
			recordType = strings.ToUpper(recordType)

			recordContent := req.FormValue("content")
			ttl := req.FormValue("ttl")
			ttlNum, err := strconv.Atoi(ttl)
			if err != nil {
				formErrors.Errors = append(formErrors.Errors, "invalid ttl")
			}

			dnsRecordCount, err := database.CountUserDNSRecords(context.DBConn, context.User.ID)
			if err != nil {
				log.Println(err)
				resp.WriteHeader(http.StatusInternalServerError)
				return failure(context, req, resp)
			}
			if dnsRecordCount >= MAX_USER_RECORDS {
				formErrors.Errors = append(formErrors.Errors, "max records reached")
			}

			dnsRecord := &database.DNSRecord{
				UserID:   context.User.ID,
				Name:     name,
				Type:     recordType,
				Content:  recordContent,
				TTL:      ttlNum,
				Internal: internal,
			}

			if !userCanFuckWithDNSRecord(context.DBConn, context.User, dnsRecord, USER_OWNED_INTERNAL_FMT_DOMAINS) {
				formErrors.Errors = append(formErrors.Errors, "'name' must end with "+context.User.Username+" or you must be a domain owner for internal domains")
			}

			if len(formErrors.Errors) == 0 {
				if dnsRecord.Internal {
					dnsRecord.ID = utils.RandomId()
				} else {
					dnsRecord.ID, err = dnsAdapter.CreateDNSRecord(dnsRecord)
					if err != nil {
						log.Println(err)
						formErrors.Errors = append(formErrors.Errors, err.Error())
					}
				}
			}

			if len(formErrors.Errors) == 0 {
				_, err := database.SaveDNSRecord(context.DBConn, dnsRecord)
				if err != nil {
					log.Println(err)
					formErrors.Errors = append(formErrors.Errors, "error saving record")
				}
			}

			if len(formErrors.Errors) == 0 {
				http.Redirect(resp, req, "/dns", http.StatusFound)
				return success(context, req, resp)
			}

			(*context.TemplateData)["FormError"] = &formErrors
			(*context.TemplateData)["RecordForm"] = dnsRecord

			resp.WriteHeader(http.StatusBadRequest)
			return failure(context, req, resp)
		}
	}
}

func DeleteDNSRecordContinuation(dnsAdapter external_dns.ExternalDNSAdapter) func(context *RequestContext, req *http.Request, resp http.ResponseWriter) ContinuationChain {
	return func(context *RequestContext, req *http.Request, resp http.ResponseWriter) ContinuationChain {
		return func(success Continuation, failure Continuation) ContinuationChain {
			recordId := req.FormValue("id")
			record, err := database.GetDNSRecord(context.DBConn, recordId)
			if err != nil {
				log.Println(err)
				resp.WriteHeader(http.StatusInternalServerError)
				return failure(context, req, resp)
			}

			if !userCanFuckWithDNSRecord(context.DBConn, context.User, record, USER_OWNED_INTERNAL_FMT_DOMAINS) {
				resp.WriteHeader(http.StatusUnauthorized)
				return failure(context, req, resp)
			}

			if !record.Internal {
				err = dnsAdapter.DeleteDNSRecord(recordId)
				if err != nil {
					log.Println(err)
					resp.WriteHeader(http.StatusInternalServerError)
					return failure(context, req, resp)
				}
			}

			err = database.DeleteDNSRecord(context.DBConn, recordId)
			if err != nil {
				resp.WriteHeader(http.StatusInternalServerError)
				return failure(context, req, resp)
			}

			http.Redirect(resp, req, "/dns", http.StatusFound)
			return success(context, req, resp)
		}
	}
}