fix: validate filepath in request

[Yisaer]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 15.15152% with 28 lines in your changes missing coverage. Please review.

Project coverage is 70.81%. Comparing base (b898083) to head (159c32c).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/server/rest.go	0.00%	6 Missing and 2 partials ⚠️
internal/server/async_rest.go	0.00%	4 Missing ⚠️
internal/server/import_export.go	0.00%	3 Missing and 1 partial ⚠️
internal/server/plugin_init.go	0.00%	3 Missing and 1 partial ⚠️
internal/server/schema_init.go	0.00%	3 Missing and 1 partial ⚠️
internal/server/service_init.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3248      +/-   ##
==========================================
- Coverage   70.85%   70.81%   -0.03%     
==========================================
  Files         395      395              
  Lines       44335    44368      +33     
==========================================
+ Hits        31411    31419       +8     
- Misses      10430    10456      +26     
+ Partials     2494     2493       -1     

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